He gives in.

Overwhelmed by Evelyn's advances Big boy gives into his lust. He puts his hand on the back of Evelyn's head and grabs a fist full of her curly auburn hair. He pushes her head down and Evelyn opens her mouth, her tongue rising to meet him as he enters her. She moans and sends shivers down his shaft and into his sack as she begins to circle the tip with her tongue. Big boy pushes her down the first few inches of his cock and looks up at Biter and the cuck. Both stand there watching unsure of what to do with themselves. Biters foot long erection stands straight up, leaking precum all over the floor of the tent. Big boy can see the effort it takes to control himself on his face. The smell of wet cunt must be driving him wild. The intern turns his head and trues to keep his hands from touching himself by clasping them behind his back but the tiny tent in his pants betray his arousal.

Big boy returns his attention to Evelyn and he decides to tease the others a little more. He takes his hand off of her head and allows her to freely bob up and down his shaft. He then reaches down and lifts Evelyn's lab coat before he tears the back of her pants exposing her rear for the others to see. He spreads her cheeks and her glistening slit peeks out into the cool air of the tent. Evelyn lifts her head and tilts it back growling with hunger as she does. She then returns to Big boys cock and quickens her pace, making loud wet slurping sounds as she does. Big boy grins as he sees the results of his actions.

Biter is about to lose it. His cock flicks upwards, nearly hitting himself in the chest, and causes droplets of precum to fly up Evelyn's back. He clenches his jaw and stamps his feet. The cuck has lost his battle with modesty and he now stares at Evelyn's big fat ass as he jerks his little 4 inch dick. Evelyn forces her self down 8 inches of big boy's cock and gurgles as she strums her clit. Split bubbles out of her mouth and falls on to her chest, lightening the dark fabric of her tank top.

Big boy pulls her off him and tosses her on the ground infront of Biter. Her head lands at his feet as she hacks up globs of precum and spit.

Big boy get on his knees, pulls her up into doggy, and slides into her cunt. Evelyn shakes with pleasure and shouts "Oh yes! Show Mama you love her! Fuck your pussy!" as he begins to pound. Big boy gives Biter a nod and he reaches down lifting Evelyn's torso up until her mouth is level with his dick and then he shoves it in. It's now Biter's turn to lift his head and give voice to his pleasure. Evelyn puts her hands against Biter's thighs and tries to regulate how deep he goes into her throat but Big boy's strong thrusts **** her further and further down Biter's shaft. Eventually the pleasure makes her weak and her arms fall limply to her sides as her eyes roll up into the back of her skull. A long moan tries to escape her mouth but instead just reverberates in her throat, adding an extra sensation that drives Biter over the edge. He begins to cum down her throat and directly into her stomach. Evelyn's tongue and then her face and breasts are coated in his cum as Biter pulls out and falls flat on his ass gasping for air.

Evelyn's tank top is completely soaked in cum. The black fabric streaked with the yellowish green seed of the mutants clings to her bouncing breasts as Big boy continues to thrust up into her. He pulls Evelyn backwards, on top of his hips, as he lays on his back. His knees still up infront of her, Evelyn reaches forward and uses them to steady herself as she rides him in reverse cowgirl. She rolls her hips before using Big boy's knees to push herself up. She lifts herself all the way until just his tip of his member remains inside her and then drops slamming herself down and burying him balls deep. She kicks her legs and shivers around him as she lets out short gasping cries of pleasure.

The cuck in the corner is the next to lose control. He fucks his fist fast then cums as he watches the orgasms rip through Evelyn's body. His clear watery semen trickles down across his knuckles as he continues to pump in a vain attempt to stay hard. His dreams of sloppy thirds falling to the floor as he sinks to his knees.

Evelyn is now barely conscious as Big boy continues to take his pleasure from her body. He reaches out and grips her around the midsection and, much like the first time they fucked, he begins to slide her up and down his shaft like a flesh light. The air is thick with the scent of sex and the sense of power and control this encounter has brought him is driving Big boy wild. Evelyn's wet well used cunt glides along his shaft as he uses her body to plunge himself into her over and over. Soon he feels his cum boil up his shaft and with one swift tug he pulls Evelyn all the way down his length and blows his load. He pulls her off him and let's her fall to the floor. She is completely glazed and her shuttering breaths rack her body as she babbles about wanting more.

They all just lay where they are and drift to sleep completely exhausted.