Based loosely off of eigakas artwork:
https://rule34.xxx/index.php?page=post&s=view&id=2284327
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He laid on her bed, the clock reading 2:45. The room was silent, save for the occasional rustling he made. He struggled against whatever force compelled him to have these urges, to stiffle the swelling between his legs, but nothing could help. During the day no he tried to relieve the pressure, but  again and again at night the urges returned. Here, in the shared bed next to the fertility goddess he now had to live with, the urges returned with a new fury. "F-fuck". His cock throbbed harder than ever, and had a new coating of cum steadily leaking, dripping thick and fertile batter onto the sheets, which now pressed over the side of the bed, pushed outward by his monsterous length. Compared to his own small stature, the cock dwarfed any other feature on his skinny and short frame. The aching in his equally massive globes seemed to grow steadily more intense, his body shivering with a need for release from the hormonal prison. "I h-have to do something about this, before I ruin the bed!", he thought. With deliberate movements, he began to rise to begin his search for a room to free himself from the torture, and hopefully find some towels to clean up with afterward. Just as he began to rise he felt the blankets covering him from exposure fall to the floor. With dread filling him, he heard movement from the other side of the bed.

A draft came over her, as she slowly rose from her dream -a dream which she had much preferred to stay in. The new precense of a male, albiet one with a seemingly unimpressive physique, had invaded her dreams. She glanced down, noticing that her luscious body was covered in a cold sweat, her excitment from her dream contributing to a needy aching in her. "Goddamnit, I was so close to the best part" she mumbled dissapointedly. Sitting fully upwards now, her eyes strained against the darkness of the room. She saw no covers on the bed, and even more oddly, no sign of her bedpartner. Annoyance began to take hold as she thought of the wimpy and shy new housemate. Her offer of sharing her bed would be revoked immediately -the robbery of her blanket and wet dream sending her off the edge. Still not entirely seeing, she rose to search for wherever the boy had gone. Nude, she started for the door but stepped in a viscous, warm liquid. A new level of annoyance took hold as she reached for the light switch.

Light filled the room, and his eyes confirmed to his horror that she had woken up and was looming over him. Despite being gripped in terror, his eyes nevertheless feasted on the display in front of him. Bountiful heaps of woman filled his vision. Taking in every ounce of breast and ass he could see, his eyes lingered especially on the hips she sported, which glistened with sweat. They resonated with his instinctual knowledge that she was made to breed, to be a vessel for the pent up urges he carried. His heart pounded with fear, but also a new, almost primal urge.

She looked down, her eyes adjusting to the light. The fluid she stepped in seemed to carry a trail, a trail which led her something that belonged in her dream. Something that, defying all logic, belonged to the boy. She too felt a resonation with her instinct. The fuckstick between his legs was practically made for filling, pounding, and breeding. The potent rod was already seeping cum, which was wasted on the floor of the room. Her body shuddered, as thoughts of it instead spilling into her womb filled her mind. Faltering with words, she stood babbling at the boy, his face covered in what could only be described as abject terror.

"Y-y-you took the... off the bed and... woke-"
"I didnt mean to! It was just so h-hard and it wouldnt go away, I'm sorry!"
"You can't stay... in my room any..."
'What am I saying!? Why am I kicking that beastly dick out of here!?'
"I-I'm  sorry, please don't! I can't hel-"
"It smells..."
"I'm s...sorry... wait, what?"
"It smells so good~"
She bent down, her lust driving her rather than reason. She scooped him up and held him out in front of her, his tiny stature easy to hold save for the gigantic cock -which stood rock hard between them and covered the arms length separating them. a
Its cockhead pressed against her pussy, the steady flow of pre mixing with her leaking fluids which flowed down her thighs and legs.
"Forget leaving. Im never letting you out of here."
Her lips covered his, her tongue dominating his mouth. The distance between them closed as they twirled their tongues around one other. His cock was pressed firmly between her silky thighs and ample ass, and his hips began thrusting without his control. His eyes rolled back as his tongue gave up fighting the invader and allowed her to have full reign over his mouth. The heaven of her thighs, and the tongue which savored every inch of his mouth -nearly his throat- was too much to resist any longer as he fully opened his mouth to her, pulsing and twitching between her legs. Feeling she had made clear who was in charge for tonight, she extracted his cock from her thighs and her tongue from his throat, and threw him onto the bed.

Unable move and unable to think, he laid exhausted on the bed as he looked up at her even more glistening body. Her assets heaved as she took each labored breath. He noticed her eyes- which were now filled with animalistic lust. It terrified -but also excited him.

His cock stood even taller now, leaking and oozing with anticipation. As she looked on it her knees buckled, and she fell to the floor. She was now eye level with his legs hanging off her, no, /their/ bed. In addition to the horsecock he sported, she noticed how cute his ass was as well. 'I'll have to come back to that' she thought to herself. Her eyes again returned to the cuntfiller, and they trailed down from its glistening grapefruit sized head, to the thick, veiny, sturdy shaft, and fixed on the enormously gorged balls, filled to the brim with cocksnot. She wanted nothing more than to empty them into her stomach- a thought that swam in her head as she lowered her  on apparent autopilot.

His eyes did not believe what was happening- but just like a pinch on the arm, the tongue now carressing and massaging his balls and taint confirmed that he was in fact awake. Her tongue made broad strokes as it hung out of her gaping mouth, her eyes lidded over in carnal ecstacy. Her mouth wrapped around and inhaled as much of his heavy balls as it could, eliciting a moan -more of a squeak- from her newly acquired fucktoy, and filling the room with a song of sucking, licking, gasping, and moaning. Her nose filled with the thick smell of musk and sex, amplifying the torrent of fluids streaming down her own legs and puddling on the floor. She searched doggedly for more tastes, trailing up and down. She meandered, eventually finding her way to his hole, which she attacked just as aggressively as his mouth.

He gasped as she licked around his ass, feeling every inch of the outside of his hole. He would have been humiliated, had his mind not been occupied with how orgasmic it felt. He was snapped out of his musings as she grabbed his legs, throwing them back and lifting his ass upward, effectively pinning him with his ass facing the ceiling. She looked into his eyes from over his cock and between his legs. She stared longingly into his face through half-closed lids as the tongue hanginf out of her mouth slowly entered him. Her tongue probed deeper and deeper, wriggling around in an effort to taste every inch of him. Occasionally, she would rear back and spit, eliciting a shiver from him. Cum slowly dripped onto his face, as the tonguefucking he recieved made him curl his toes and moan incoherently. She continued, licking, sucking, fucking and slurping his asshole, their sounds filling the air.

Eventually, she leaned back, and admired her handiwork. Nuts thoroughly covered in her spit, asshole nearly gaping from her assault, and her boy's face contorted in pleasure and embarrasment. She hoped the image would stay in her head forever. Releasing him from her hold, his legs ploped back down with a squish off the edge of the bed, and she returned squatting in front of his nuts. Looking upwards she slid her tongue up the shaft, savoring the taste of his skin, as well as the new and orgasmic taste of his cum which streaked down in abundance from the tip. Reaching the top, her body was wracked with shivers as an especially intense throbbing overtook the pillar of cockmeat, shooting a rope onto her face. She made up her mind that she had had her fun, and that it was time to begin the main event.

As she stood up, he watched each and every curve of her impossibly lewd body turn around. He sat up while she bent over, ass arched and presenting herself to him.
"From now on, every night, this is your cockwarmer."
Her ass slowly lowered onto his cock, hesitating umbearably close to entry.
"On one condition", she said, using every force of self restraint in her to not slam down with full force.

He thrusted his hips in futility, trying to do anything to enter the sexual perfection that dripped mere inches above him. Moaning in agony, he croaked "a-anything you want, I dont care, please just-"
He was cut off as her ass engulfed his cock entirely, her soft, tight, blissfully slick and warm cunt already milking him to its best ability.
"BREED ME!"
Her ass raised and again slammed down on his cock, jiggling violently as she slammed her titanic rear against his massive dick
"Fill me with every ounce of cum you have, give me everything! Fill me until my womb overflows, and my stomach is full!"
More sounds of slapping and moaning filled the room as she rode him.
"MAKE ME YOURS!"
Their pact agreed upon, she set to work ensuring he kept their pact.
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May write more, idk