You walk into the room

You stand frozen in the doorway, your hand still resting on the door frame, knuckles white. The scene before you is surreal — Carrie, your Carrie, on all fours on Jake's unmade bed, her body impossibly large now. At 6'3", she dwarfs the bed frame, her long legs spread wide, her back arched deeply as Jake grips her hips from behind. His hands look almost small against her now, her waist thick with new muscle and curve, her ass full and round beneath his thrusting hips.

Jake's cock slides in and out of her with a wet, rhythmic sound that fills the room. He's not gentle about it — his hips slap against her with each thrust, and he lets out a low grunt, his head thrown back. "Fuck, she's tight even at this size," he says, glancing over his shoulder at you with a smirk. "Your girl's got one hell of a pussy, Eric. You know that?"

Carrie turns her head to look at you, her face flushed, her eyes glassy with pleasure. Her dark hair sticks to her sweaty forehead, and her lips are parted, panting. "Baby," she breathes, her voice strained between thrusts. "Baby, please. Come here. I need you too. I love you. He's just — ah — he's just the source. Like a — fuck — like a protein shake. You know?"

Jake laughs at that, a crude bark. "A protein shake. That's a new one." He drives into her harder, and Carrie gasps, her massive breasts swaying beneath her, nipples grazing the sheets. They're enormous now — DD cups at least, heavy and full, the kind of tits she never had before last night. Her whole body has scaled up with a kind of impossible perfection, every proportion maintained, every curve amplified.

"Eric." Her voice is more urgent now, her eyes locked on yours with genuine desperation. "I can feel it building in him. He's close. He promised he'd pull out — right, Jake? You promised."

"Yeah, yeah," Jake says dismissively, not slowing his pace. "I'll pull out. Don't worry about it." But his grip on her hips tightens, his thrusts becoming shorter and faster. He's clearly getting close. "Though I gotta say, this pussy feels pretty fucking good. Might be hard to pull out in time."

"Jake," Carrie says firmly, though her voice wavers with pleasure. "In my mouth. That's the deal."

She looks back at you again, and there's something almost pleading in her expression — not just sexual pleading, but emotional. She wants you to understand. She wants you to be okay with this. She wants you to want this too.

"I'm going to be so big for you, baby," she whispers, reaching one hand back to spread herself wider for Jake. "Bigger than this. Don't you want that? You said — you said get as big as I want."

Your cock is hard. You hate yourself for it, but it's undeniable — tenting your boxers visibly as you stand there watching your roommate fuck your girlfriend. The jealousy and the arousal are tangled together so tightly you can't separate them, each feeding the other in a nauseating loop.

Jake groans loudly. "Fuck, I'm getting close. Get ready, Carrie."

Carrie immediately pulls forward, Jake's cock slipping out of her with a wet pop. She spins around on the bed with surprising agility for her size, dropping to her knees on the mattress, her face level with his crotch. His cock is enormous — thick and veiny, glistening with her juices. She wraps both hands around the shaft and opens her mouth wide, her tongue extended, her eyes flicking up to meet Jake's gaze with an almost clinical focus.

"Eric, come watch this," she says, her voice breathless. "Come see what happens to me."

You nod slowly, stepping further into the room. Your feet carry you closer even as your mind screams contradictions. But you've made a decision — let this finish, then talk to her. Alone.

"Okay," you say, your voice hoarse. "Okay, Carrie. Do it."

Her face lights up with relief and gratitude. "Thank you, baby. Thank you. I'll make this up to you, I swear —"

Jake cuts her off with a groan. "Less talking, more sucking." He grabs the back of her head with one hand, guiding his cock toward her open mouth. Carrie doesn't hesitate — she takes him in, her lips stretching around his thick shaft, her cheeks hollowing as she works him with obvious skill. Her hands grip his thighs for leverage, and she bobs her head in a steady rhythm, slurping sounds filling the room.

Jake's head falls back. "Holy shit, she's good at this. Fuck."

You watch from three feet away, your erection straining painfully against your boxers. Carrie's eyes find yours as she works Jake's cock, and there's something in them — reassurance, maybe. Or apology. It's hard to read through the glazed pleasure already building there. She's anticipating the growth. She's craving it.

It doesn't take long. Jake's hips buck forward and he lets out a long, guttural moan, both hands gripping Carrie's head now. "Fuck, fuck, here it comes — swallow it all, you big bitch —"

Carrie does. Her throat works visibly, convulsing around his shaft as pulse after pulse of cum floods her mouth. You can see it — the sheer volume is staggering, far more than any normal man produces. Her eyes go wide, then roll back slightly as she gulps desperately, not wanting to lose a drop. Jake keeps cumming for what seems like an impossibly long time, his cock twitching against her tongue.

Then it starts.

Carrie pulls off his cock with a gasp, a thin strand of cum connecting her lower lip to his tip. Her whole body shudders. "Oh god," she whispers. "Oh god, oh god —"

The growth hits her like a wave. You've seen it before but it's no less stunning — her shoulders broaden, her spine elongates with audible pops, her thighs thicken with new muscle and flesh. Her breasts swell larger, her hips widen, her ass rounds out even more. She's growing right there on the bed, her body expanding in real-time, her skin flushed and glistening with sweat. Her moans are almost orgasmic, deep and guttural, her hands gripping the sheets as her fingers lengthen.

Jake watches with wide eyes, his softening cock still dripping. "Holy fuck. That is the wildest thing I've ever seen."

It lasts nearly a minute. When it's done, Carrie is panting on all fours, her body trembling with aftershocks. She's bigger — noticeably bigger. Her head nearly brushes the ceiling now, her legs hanging off the end of Jake's bed. She must be close to seven feet tall.

"Carrie," you say firmly, stepping forward. "I need to talk to you. Alone. Now."

She looks up at you, and for the first time there's a flicker of something like guilt in her expression. "Okay," she breathes, still trembling. "Okay, baby. Just — give me a minute."

Jake stretches back on the bed with a satisfied grin. "Take your time. I'll be here whenever she wants another round."

You ignore him, extending your hand to Carrie as she carefully climbs off the bed, her new height making the room feel like it was built for children.