Head to Casey's place

You unlock Casey's dorm room door, pulling Charlie inside by his shirt collar. The moment the door closes, he pins you against it, his mouth finding yours in a hungry kiss. Casey's body responds differently than your own—a rush of heat spreading faster, more intensely.

"Fuck, you feel so different," Charlie murmurs against your neck, his hands exploring unfamiliar curves. "But I can tell it's still you in there, Mack."

You guide his hands to Casey's breasts, arching into his touch. "Different good?"

"Different amazing," he growls, lifting you suddenly. Casey's body is lighter than yours, and Charlie carries you effortlessly to the bed, laying you down on the unmade sheets.

You pull him down on top of you, wrapping Casey's legs around his waist. "I want to feel everything in this body. Everything."

Charlie unzips Casey's dress with practiced fingers, sliding it down over her hips. He pauses, taking in the sight of her nearly naked body, clad only in the black thong you selected earlier.

"Jesus," he whispers. "Her skin is so fucking pale." His fingers trace patterns across Casey's stomach, watching goosebumps rise in their wake.

"Sensitive, too," you gasp, Casey's voice higher and breathier than yours. "Everything feels... more."

Charlie strips quickly, then removes the last of Casey's underwear with reverent hands. When he enters her body, you cry out—the sensation familiar yet entirely new.

"Oh my god," you moan, clutching at his shoulders. "It's so different. Harder, I need to feel—"

He obeys, driving deeper, and you lose yourself in the novel sensations of another woman's pleasure. Casey's body responds in ways yours never has—quicker to build, more intense at the peak.

"I can feel how close you are," Charlie pants, his rhythm relentless. "Come for me, Mack. Let me feel her come."

When orgasm hits, it blindsides you—radiating outward in waves that make Casey's back arch and her toes curl. You cry out words you've never said, blasphemies and promises intermingling as her body shudders beneath his.

Afterward, lying tangled in Casey's sheets, Charlie traces lazy circles on her stomach. "That was... holy shit."

"And that's just round one," you say, rolling over to straddle him. Casey's body recovers faster than yours, already humming with renewed desire. "We've got all night. And then six more days."

Charlie's eyes darken with lust. "Poor freshman isn't going to know what hit her when she gets this body back."

You laugh, tossing Casey's red hair. "Rules just say no permanent modifications. They don't say anything about memories her body might keep."

As Charlie pulls you down for another kiss, you wonder fleetingly if Casey will remember any of this—the phantom sensations of pleasure given by a stranger in her own bed. The thought sends a thrill through you as you begin round two.