Head to Charlie's place

You step into Charlie's off-campus apartment, your borrowed body humming with anticipation. Charlie barely gets the door closed before he pins Casey's body against it, his mouth finding yours with urgent hunger.

"Fuck, this is wild," he breathes against your neck. "You look completely different but you kiss exactly the same."

You laugh, running Casey's fingers through his hair. "That's because it's still me in here, baby. Just with some... upgrades."

He pulls back, taking in Casey's body with undisguised lust. "I can't believe you're really in there. Prove it's you."

You smile, leaning close to whisper in his ear about that time behind the library during finals week last semester—a memory only Mackenzie would have.

"Convinced?" you ask, already unbuttoning his shirt.

"Completely," he growls, lifting you easily—Casey's body is lighter than your own—and carrying you to the bedroom.

The sensation of being undressed in an unfamiliar body is disorienting but thrilling. Charlie's hands feel different on Casey's skin—more calloused, hotter. When he trails kisses down Casey's neck to her breasts, you gasp at sensations that hit differently than in your own body.

"Oh my god," you moan as he takes a nipple in his mouth. Casey's body is more sensitive there than yours. "That feels... incredible."

"What else feels different?" Charlie asks, his voice rough with desire as he moves his hand between Casey's legs.

You arch into his touch, discovering new pressure points and responses. "Everything," you pant. "It's like learning to fuck all over again."

That seems to drive him wild. He strips off his remaining clothes, his erection obvious. "I want to fuck Mackenzie," he growls, "in Casey's hot little body."

When he enters you, the sensation is familiar yet utterly new. Casey's body responds differently—tighter, with different angles sending shockwaves of pleasure. You wrap Casey's legs around him, finding you can bend them further than your own.

"Oh fuck, Charlie!" The voice that cries out isn't yours, but the pleasure certainly is. "Harder!"

He obliges, driving into Casey's body with an intensity that borders on desperation. You feel Casey's body building toward climax faster than your own ever would, a tightening coil of sensation that feels alien yet incredible.

"I'm close," you gasp, surprised by the speed. "This body comes so easily."

Charlie groans at your words, his rhythm faltering. "That's the hottest fucking thing I've ever heard."

When orgasm hits, it crashes through Casey's nervous system differently than yours—sharper, more focused, radiating outward in waves that leave you gasping and clawing at Charlie's back. He follows soon after, collapsing beside you on the bed.

"Holy shit," he pants, staring at the ceiling. "That was..."

"Different," you finish for him, running Casey's hands over her own body, feeling the unfamiliar curves. "And we've got six more days to explore all the differences."

Charlie turns to look at you, his expression a mix of lust and something unreadable. "Does it bother you? That she doesn't know what we're doing?"

You shrug Casey's shoulders. "It's just part of pledging. Everyone goes through something. Besides, it's not like I'm going to hurt her body." You trace a finger down his chest. "I'm just borrowing it for some fun."

He nods, seemingly satisfied with your answer. "What else do you want to try while you've got it?"

A wicked smile spreads across Casey's lips as you consider the possibilities. "Everything."