Bratty x Catty x Frisk Threesome (Undertale)

Frisk walked down the alley, scratching his head. A suspicious paper outside the MTT Resort told him to visit the alley just to the right of the building. It seemed innocent enough, but there didn’t seem to be anything back there. Just a joke, perhaps? He wouldn’t put it past Papyrus to trick him into going down an alley in order to solve some puzzle or word jumble, but the note outside wasn’t in his handwriting.

Turning around to leave the alley, Frisk bumped into someone, falling down onto his ass with an ‘oof’. Looking up, a tall alligator-looking monster stood before him, tilting her head down at him with a surprised look on her green, scaly face. Behind her stood a shorter monster, a purple cat. The two of them were dressed like a couple of trendy teens, each of them eating one of those gross Glamburgers.

Frisk opened his mouth to speak, a little intimidated by the alligator glaring down at him, but before any words could make their way out, the cat spoke. “Like, woah! Watch where you’re goin’!” She smiled a wide smile, walking closer and standing next to her friend, who remained silent. “I, like, totally don’t think I’ve ever seen you around here before! My name’s Catty, and this is…uh, Bratty? Are you spacing out or something?” She jumped up, waving her hand in front of Bratty’s face, who continued to stare down at Frisk in a rather unnerving fashion.

“Well, whatever. She’s my best friend, but she can get a little spacey sometimes. Anyway, you wanna buy this cowboy hat we found in the-“ Suddenly Bratty gasped, her eyes shooting wide open as she pointed down at Frisk, turning her head towards her friend. “Like, oh my GOD, Catty! Do you know what that is!? He’s TOTALLY a human!” Catty gasped this time, in a manner so similar to Bratty that it bordered on imitation.

Catty leaned down close towards Frisk, sweat dripping down the side of his face. Being inspected and stared at to this degree was nerve-racking. He was almost tempted to scoot backwards, but that would only move him further back into the alley. Not to mention he was facing two opponents. If he avoided one, the other would certainly catch him. He was trapped.

Catty inspected him closely for a few moments before standing back up. “Bratty, you are TOTALLY right! He IS a human!” They both looked at him for a moment before turning to each other and whispering. The temptation to escape once again welled up inside Frisk, and this time he acted upon it. Getting to his feet as quickly as possible, he sprinted wildly to the right. If he had to choose either of the monsters to try and get past, it would have to be the cat.

Frisk, however, had underestimated his opponent. Catty moved with surprising quickness, leaping in front of Frisk with a predatory grin on her face. As he predicted Bratty was quick to move to his left side with a similar smirk, effectively boxing him in against the side of the alley. His back pressed against the side of the MTT Resort, he could do nothing as Bratty stepped forward, much too close for comfort, supporting herself with her hands as she pressed her body against Frisk’s.

“You know, me and Catty know ALL about humans.” Off to the side Catty nodded. “We’re pretty much, like, experts on the matter.” For some reason Frisk struggled to believe her. Bratty turned his face back towards her, speaking again. “Catty and I are SO hyped for the destruction of humanity. Once that total goober Asgore gets rid of the barrier, me and Catty are gonna go up to the surface and have tons of fun!” She paused, licking her lips. “But in order to get rid of the barrier, Asgore needs, like, seven human SOULS, right? And he already has six, which means…yours is the last one!”

Catty spoke up again. “So like, Bratty and I were thinking…we could TOTALLY do that goofball a favor by just getting your SOUL ourselves! Good idea, right?” Panic began to well up within Frisk, his heart pounding. Was this it? Was this how it would end? At the hands of an alley-cat and an alley-gator? Bratty leaned in very close, whispering in Frisk’s ear. “So where is it?” Frisk blinked, nervously asking what she meant.

“Uh, DUH! Your SOUL! Where do humans keep their SOULS?” She playfully pushed Frisk to the ground, straddling his waist as she felt all over him, searching his inventory and tossing all of the useless junk to the side, making sure to pocket his gold when she thought he wasn’t looking. Catty giggled before making her way around to Frisk’s head, kneeling down and patting his upper body in a similar fashion, her chest pressing against his face. The two of them smelled like a mix of trash and perfume, but not even Frisk could deny that the two of them were stimulating him in all of the right ways.

Between Bratty grinding against him and Catty’s chest pressing against his face, it wasn’t long before Frisk’s DETERMINATION began to swell up, much to his own shame. Bratty felt it almost immediately, grinding against it a little harder just to confirm she had felt something down there, making Frisk shiver from the sensations. Her slender, firm body was attractive in an exotic way. She shifted backwards, leaning down closer to his crotch and examining the growing outline. “Like, what’s this, hmm? Is this where you keep your SOUL?” She rubbed his DETERMINATION with her hands through his shorts, causing Frisk to gasp quietly.

Catty grinned, crawling over towards Bratty, sitting on Frisk’s face in the process, much to his surprise. Especially since she was wearing a miniskirt along with a pair of panties. He expected quite the stench, but was pleased to discover she smelled relatively clean. There was that ever-present smell of perfume along with sweat, but that was it. It smelled exactly like her. And it only turned him on even more.

Bratty and Catty both watched Frisk’s DETERMINATION with intense curiosity, gasping in unison when it twitched from the stimulation Catty was unknowingly providing. By now he was pitching quite the tent. “Like, Bratty, this MUST be where his SOUL is. Pull his shorts down so we can get it!” Bratty nodded, tugging the article of clothing away, Frisk’s DETERMINATION springing upwards, finally free of its binding.

The two girls stared, instinctively blushing, as if they both knew deep down what they were really looking at. Bratty was the first to move, wrapping her slender fingers around it. “T-This can’t be it…right Catty?” The cat shrugged, unable to take her eyes off of it. “Like, I dunno! I’ve never seen a human’s SOUL before!” As she examined it, though, an idea formed in her head. “Hey, Bratty. There’s totally a hole on the tip, right? Maybe it’s like, a straw or something. You should try sucking his SOUL out through it!”

Bratty averted her eyes for a moment, thinking it over. “Y-You think so, Catty? I guess it KINDA looks like one of those straws they put in the Starfaits at the Resort.” Bratty leaned down close, licking her lips before extending her long reptilian tongue outwards, gently licking Frisk’s DETERMINATION. Frisk groaned, instinctively pressing his face up against Catty’s panties, eliciting a gasp from her. Bratty gave him a few more test licks, so Frisk decided to do the same to Catty, lapping at her through her panties.

Catty moaned loudly, pressing her paws to her cheeks. “W-What are you doing, h-human!? No one’s ever licked me there b-before, aside from Bratty!” Bratty watched with lewd curiosity as her friend arched her back, her moans echoing through the alley. “H-Hey, human! Like, what do you think you’re doing with my best friend! If you don’t stop, I’ll…I’ll suck your SOUL right out!” Without any hesitation Bratty leaned down, taking Frisk’s DETERMINATION into her mouth and wrapping her long tongue around it, sucking and slurping to the best of her ability.

Frisk, naturally, started licking Catty even faster, pushing her panties to the side with his tongue before lapping directly at her pussy. The shock of being aroused and touched like this by a human gradually began to fade away, and the irresistible, glowing heat of pleasure filled the gap left in her mind. Her gasps gradually shifted into moans, her hips beginning to shift back and forth against Frisk’s face. At the same time, Bratty had done a surprisingly effective number on Frisk, his DETERMINATION throbbing with need, nearly ready to explode.

But before she could get him to the tipping point, Catty spoke between moans. “Ahnn, w-wait, Bratty…you like, HAVE to try this…it feels so gooood…don’t suck out his SOUL yet!” Bratty opened her mouth to speak, unable to think of anything to say. She would have been lying if she said seeing her best friend getting eaten out wasn’t turning her on. She pulled down her jeans, rubbing herself between her legs before looking down, once again taking a close look at Frisk’s DETERMINATION. The shape, the size, the position…something about it seemed so right to her…

Suddenly, an idea formed in her mind, blossoming like a beautiful flower amidst an arid wasteland. She lifted herself up a bit, positioning herself above Frisk’s DETERMINATION before slowly lowering herself down onto his, gasping loudly. “A-Ahh! It’s so hot…I can, l-like, feel inside me…” Catty didn’t waste a second, leaning forward and wrapping her arms around her best friend, kissing her deeply. Bratty responded in kind, her tongue mingling and wrapping around her best friend’s tongue, like they would always do late at night.

Frisk did all he could, basically pinned under the two girls, passionately kissing each other and grinding against both his face and his DETERMINATION. He thrust his hips upwards as hard as he could, each movement making Bratty moan louder and louder. He lapped at Catty with the same rhythm, eagerly lapping at her pussy from below, her moaning and gasping starting to bleed together into an incomprehensible humming.

Before long the two best friends embraced each other again, locking lips again as they were brought over the limit. At the last second
the two of them shrieked in unison: “M-METTATON!!!” Frisk groaned loudly as he finished, though he was largely upstaged by Bratty and Catty. His DETERMINATION released inside Bratty’s pussy, so powerfully that he could barely feel anything below his waist when it was finally over.

Frisk woke up some time later, having passed out after the rather intense threesome. Bratty and Catty were nowhere to be seen, though they had left a note for him. It explained how they were “just kidding” about wanting humanity to be destroyed, and that they were “TOTALLY okay” with humans now, and that he could keep his SOUL since he had been so friendly to them. They also asked Frisk to visit again some time, an invitation he wasn’t entirely sure to accept or not.

On the back was another note apparently left by Catty alone, if the cute drawing of a paw was any indication. She talked about how “like, WONDERFUL” it had all felt, and as a token of her appreciation, she had left him the cowboy hat she found in the trash a few days ago. He smiled, checking his inventory…and finding that it was totally empty aside from the hat, including all of the gold he had saved.

God dammit.