Everyday Life with a Humanboi (Chapter 5)

I woke up again with the sound of soft snoring at my chest. Peering down I saw the ponytailed red hair and black feline ears of Kora, her large furred paws gripping my arm loosely.

It felt...nice. A warmth washed over my chest as my heart raced a little. I guessed this was what it felt like to rest in the arms of a lover....save the fact that Kora and I weren't lovers in actuality. My back aches were progressing in pain, like a minor headache starting up that wasn't too difficult to ignore for a little while longer.

I figured this might have been my only chance to take in the sensations of lying with someone in bed, and bowed my head forward a little.

I got my first real whiff of Kora's natural scent (at least in what humans can detect). It wasn't pungent, but there was a noticeable musky fragrance to her hair. A tad briny, it still had an aroma that made my mouth water a bit like a citrusy fruit. And yet there was a subtle hint of sweetness I could somewhat sense. All in all it was a good scent this monstergirl gave off, my heart thumping a bit now. I gulped a lump in my throat as one hand went to my bunkmate's face, feeling the hot and velvetine-smooth skin of her light brown cheek.

I tried not to tremble, and it took all my willpower not to squeak in fright when Kora turned her head slightly to face my now sweating palm, breathing in the scent audibly. A low, rumbling purr resonated in her throat like the growl before, but it was softer, more peaceful in its tone and frequency. Her purple paw reaching up, the manticore girl grasped my much smaller hand and continued her soft purring, licking at my palm slowly yet eagerly. Though human-sized, she was like a cat licking your hand, the rough yet wet muscle lapping at my sweat and skin as she murred pleasantly in her sleep. I couldn't see well, but I was certain she was smiling the whole time.

An entire swarm of butterflies bounced about in my stomach at the entirety of my situation, my breathing heavier as I felt so complete, so satisfied. Nothing mattered right then. The world and everyone could have disappeared and everything would still be fine. This moment was truly magical.

My eyes then bulged as my lips let loose a choked scream as something heavy and sharp stabbed through the covers and impaled my buttocks. My back arched painfully as a red-hot electric shock fired through my body and made my head spin.

Spasming slightly, I tried to grab whatever stabbed me as my hands trembled and my blood pressure rose.

"...Huh? K-Kazuma?! What's wrong?! Why are....OH NO-!" Kora gasped in horror as she looked as pale as her sister. I could feel it. There was no mistaking the hard, smooth texture and segments as my body burned hot all over.

Kora had stung me with her tail.

My body thrashed in my hyper-sensitive state, my hips smacking forward on their own as my dick shot to full-power like never before in my life. My vision tinted to shades of pink and red as my breathing grew deeper yet faster. Everything was swirling, hot, and intense as my conscious mind withdrew and all became nothingness.

Before I knew it I found myself awake and on my back in bed. I gazed at a new ceiling that I didn't recognize as my body sweat intensely through the comforter of a futon. Looking to my side, I found that I was on a tatami mat floor, the room smelling of hay somewhat. To my right I spotted an odd night stand or desk designed in a fashion I'd never seen before. Turning my head to the left I was greeted with the two monstergirl sisters sitting upon their animal knees with tense but slightly relieved looks. Hippa sighed with a sympathetic smile. Kora avoided my glance as she looked at her furred paws in her lap.

I tried to speak, but the centauress placed her slender finger upon my lips to gently silence me. Pulling her arm back she nudged her sibling with it.

With a sniffle, Kora nervously looked up to face me, her eyes misty. Before I could try saying anything again, she bowed her upper body all the way forward as she prostrated herself suddenly.

"I'm...I'm s-so sorry, Kazuma-!" She choked, trying to speak in between barely-repressed sobs. "Please forgive me...!"

Looking to the equine sister for any explanation, I saw Hippa grow solemn as she gently rubbed her still bowing sister's back warmly. Finally, the older girl spoke in an even, serious tone that conveyed a sense of remorse.

"Thou was struck by one of my sister's barbs," she began. "I know not if thou art familiar with manticore anatomy, but a female's stingers possess venom. Once pricked, a male shalt goeth into a frenzied state of great arousal and be at the mercy of the she-manticore."

I was familiar with the basics of that. A worried pitting filled my weak stomach as Hippa continued.

"However...thine reaction to the venom was...unexpected...." she turned to look down at the now blubbering Kora.

"What...? What happened...?" I rasped in my sore throat.

Shutting her dark eyes with a pained expression, the centauress took a breath before finishing.

"Thou...thou became a beast," the elder sister actually choked on her own words as her eyes shut tight with tears forming.

Petrified, I was about to apologize with unparalleled remorse until Kora finally spoke up, holding back her tears for just a moment.

"I'm so sorry, Kazuma!" She trembled. "I didn't mean to do it! I n-never imagined anything like this would happen, I swear! I'll do anything to make it up to you, I promise!"

Shakily, I reached up to feel my body, only to find...

...nothing different. I was still my usual slightly-out-of-shape self. That is, until I reached past my slight gut to my groin.

"WHAT THE FUCK!?" I screamed in shock at what my fingers touched.

Kora sobbed loudly as Hippa leaned in to hold her sister in support.

'Thiscan'tberealthiscan'tberealthiscan'tbereal-!' My mind blared in disbelief as an uneasiness welled throughout my body and head.

In place of my circumcised penis and smallish testicles...I couldn't believe it! I sat straight up, ignoring the kicks and punches of pain that attacked my back as I threw off the comforter to reveal the truth.

Growing between my still unclothed legs was a thick tube of flesh stretching a full 15 inches long and three inches in diameter. All over my inhuman phallus were fleshy barbs that made it look like an elongated, pink, prickly pear. Situated below the mammoth, alien phallus rested a dark pink sack of smooth skin the size of two softballs. Veins pulsed, their forked bulges a full half inch in diameter.

I stared at the monster cock and scrotum growing from my crotch, poking it slightly. I flinched as the flesh sent ripples of pleasure throughout my body. Just one poke gave me the pleasure of a full-dick stroke in a lubed, warm onahole. A pressure built within my lower belly as it swelled downward to my loins. Panicking, I could only gasp as my large but flaccid penis rose up like a supernatural, spiny serpent as the cock crested up perpendicular with the floor. My heart pounded as I could only stare in disbelief and dumb amazement.

"Not again!" I heard both sisters squeal in fright as I turned to see Kora help her sister up and out of her large skirt as the centauress clumsily galloped to my legs and presented her bare, black furred and skinned horse-pussy for me.

"Hurry, get up and into her, Kazuma!" The other girl pulled me up hurriedly as she directed my hyper-sensitive mega-cock into the hot, slickening equine nethers before shoving my hips forward.

Hippa let loose a purely equine whiney from her human lips as her human half arched up in shock.

A feminine scream left my lips as my enormous member was swallowed whole by tight folds of broiling hot, wet flesh. My hips involuntarily pumped with a strength and energy like never before. I could hear Hippa crying out, her moans loud and almost pained as her front half of her body fell down, her round equine hindquarters still held high as I humped my giant penis back and forth.

Then, as suddenly as it began, I felt an immediate climax as my balls swelled even larger than before as a flood of liquid heat blazed out of my body, my form growing weak and cold. Spent, my overly sensitive dick became chilled and numbed slightly as it shriveled, withering back towards my groin as my testicles also felt a deflating, shrinking sensation. Gasping for air, I nearly fell back...

...only to be caught in the violet paws of Kora as she lowered us both to our knees, hugging me tightly as she sobbed into my shoulder. Glancing to the other girl, I felt the color leave my face as I saw Hippa's rear had slumped to the floor, gushing a thick squirt of pungent-smelling spunk into a pale-manila puddle. The amount that sloshed from her messy lips was impossible. There was no logical explanation for how I could make that much.

Shaking, the elder sister breathed raggedly as her horse legs trembled. I couldn't see Hippa's face but her voice sounded like she was hurt. What had I done?! And why did she rush to do this?!

I was still gasping for breath as Kora's warm paws held onto me like a furred straight-jacket. Even if I wanted to, there was no way to wriggle out of her grip setting aside my feeling depleted all over.

At the same time, I felt...satisfied. Not emotionally, not by a long-shot. But my body felt as if a cumbersome burden had been removed from my shoulders and I was tasting freedom for the first time. Before I could mull over the sensation, my captor laid me to rest in the futon again. Tucking me in.

Quickly Kora left the room and returned with a pile of towels and a large icy gel pack like what was used to help my face's swelling yesterday. Hurriedly the younger sibling cleaned up the copious semen on the floor, then delicately wiped Hippa's nether lips, the older girl wincing half-consciously as the gel pack was neatly laid up against the thick equine labia. Taking the sullied cloths away, Kora then returned to drape an immense quilt over her sister's horse body and upper human half.

Returning to me, Kora was melancholic in her expression, mute save a sniffle of her slightly runny nose. I used all of my strength to grab her paw (albeit clumsily). Startled, her bat wings sprang upward reflexively as she gasped in surprise.

We looked into each other's eyes for what felt like an eternity, until I finally cleared my throat and wheezed,

"I have...NO fucking clue what happened then or now, but..." I took a breath. "I didn't hurt you during that period...did I?" I asked with hesitation.

Shaking her head, Kora managed to laugh weakly.

"N-No...But you got...really..." she blushed. "Huge, shall we say...And Hippa and I had to...um...calm you..." her butt wiggled in her sitting position as her scorpion-like tail twitched nervously.

I was silent for a moment until I finally asked with trepidation,

"T-Tail...?" I said only one word as Kora quickly flushed.

"H-Hippa helped out with...um... her body too!" The manticore girl sputtered with a nervous smile.

"Speaking of...." I looked over my chest slightly to see the aforementioned centaur sister still collapsed and awkwardly tucked in.

"She'll be fine," Kora sighed in pity. "You're not the first mega-cock she's ever had sex with, and her family is among the strongest eastern centaurs, but you wore...I mean she wore HERSELF out trying to get your body to calm down."

"Wait, you said she couldn't take anything thick yesterday," I blinked, looking back up at the younger sister. "And you said 'her family'. You two are step sisters?"

Eyebrows quirking, Kora looked at me like I just spoke in a completely different tongue.

"What the hell ever made you think we were blood-related in the least? We're nothing alike."

"Uh, I thought that you were..." I gulped as I tried to explain myself. "Uh, well, half-sisters? You both have diesel libidos so I thought that maybe you two at least shared that gene..." I looked to the side to hide my embarrassment at how stupid I must have sounded in my assumptions to her.

I heard a nasally snicker as I hesitantly looked over to see...

...Kora resisting the urge to laugh.

"Hehehehe...!" She ended up giggling. "You gotta point, Kazuma. Maybe we do share an ancestor a few centuries ago that was a perverted woman," she smiled. "But seriously, my real mom died before I even started kindergarten and Dad remarried less than a year later. It was mostly for political reasons, but our parents do love each other."

I blinked, astounded that different races had no issue marrying. But I suppose having kids together was impossible for such different species. Then I recalled my first question.

"Back to the first thing," I began, Kora looking at me with interest. "Your sister...has taken big dicks before?"

With a bright red set of cheeks, Kora answered while looking over to her downed step-sibling.

"Yyyyeeaaaahhhh....part of centaur breeding policies. Last year she was...'broken in', as the saying goes in her people's culture..."

"Broken in?"

"Let me back up a bit since you likely have no clue about centaur culture," my caretaker cleared her throat. "Centaurs are matriarchal. The men have for centuries, millennia even, been the first line of defense in their territories and homes, and so to keep their armies strong they only allowed the bravest and toughest men to breed."

"Are the men all meat-heads with no class or culture?" I leered a little, remembering some monstergirl mythos interpretations.

"Only if they have testosterone in their system," Kora scratched her neck for a moment. "If a male ever loses both his testicles somehow he'll eventually...feminize."

"Like...he'll turn into a girl?" I blinked.

"Not a true female," the red headed manticore shook her head. "Know what a trap is?"

My eyes bulged as I slowly nodded.

With an evil smirk, Kora continued. "Yeah, that's what happens. Muscle deteriorates, vocal cords raise, shoulders narrow, skin becomes silky smooth, penis shrivels to no bigger than yours was before today, and facial features actually soften. Not only that, but they actually become very shy and submissive. Without checking their hind quarters you can't tell the difference between them and a female centaur save the flat chest. They're called geldings."

"That's...creepy..." I gulped.

"Yeah, kinda sad too," Kora sighed. "Male centaurs become muscle heads before the age of ten, and if their balls remain safe and secure they grow up to be brutes with much lower intelligence, only capable of being warriors until they die. But if they become geldings they're actually sweet and pretty smart. It's like they become a completely different person..."

"And your sister..." I tried to return to the topic.

"Ah! Right," she coughed. "So centaur marriages are about uniting families based on politics. The 'husband' is really only needed for siring children, and he spends most of the time away from the family in combat during conflicts and in training camps during times of peace. He only is permitted home when his mate is in heat and more children are needed."

My heart stopped. I'd came in Hippa multiple time now. Surely I hadn't...?

"Uh, Hippa's not in heat right now is she...?" I asked in fear. Knocking up a girl out of wedlock was a big no-no universally, but it had to be worse with centaurs based on what I'd just learned!

Kora laughed uncontrollably at my question.

"W-What's so funny...?" I asked shakily.

"Trust me," she wiped a tear from her eye as her giggling subsided. "If she was in heat...your cute human dick would never satisfy her. She'd probably trample you in sexual frustration."

"Comforting..." I made a mental note to avoid Hippa on her estrus.

"Yeah, so the tradition for young centauresses is to have raw sex while not being in heat to...prepare their body for future copulation."

"Whoah, stop right there," I felt my blood turn cold. "Hippa lost her virginity to some brute centaur guy just so that she could get used to being a baby-factory?!" I fumed.

"Well, I wouldn't put it THAT way..." Kora rolled her eyes.

"That's horrible!"

"To some, yeah," Kora merely shrugged. "But Hippa knew that was going to happen ever sense we were kids. It comes with the territory of being a centaur of even moderate status. Plus it's not like she's JUST going to be a mom raising kids. Her future in-laws will rear their young with hers and work together...barring any tensions that might arise between her and them...plus she'll be gaining political and financial responsibilities that come with her marrying into the family and its assets. Kinda makes up for the rest really."

I looked away, huffing in disgust. Hippa had it rough. Getting her life planned out without ever having a say...the poor girl!

"Well, anyways, that doesn't matter," Kora finally sighed. "Let's focus on the present. Like, how's your back?"

"Sore, but no worse than this morning. Wait, what time is it?" I finally asked.

Checking a clock nearby that I couldn't make out the LCD numerals of, the monstergirl had a surprised look.

"8pm," Kora responded in awe. "Time flies when you're..." she paused, her face brightening to tomato-red. "Uh, l-let me go warm up that soup Sis made yesterday and get your pill, Kazuma! Yeah! That's a good idea! Be back in a sec..." Kora uneasily laughed as she darted out of the room.

Taking a deep breath, I tried to get somewhat comfortable as I realized Day 2 had been quite a doozy...