No... no I'm a straight jock...

Your sister's unexpected words jolt you out of your daze, your heart pounding in your chest. You slowly pivot in your chair to face her, cheeks flushed with embarrassment and arousal.

Her eyes gleam with excitement behind the thick frames of her glasses, lips curled into a knowing smirk. She's dressed casually in a loose tank top that barely contains her heavy breasts and short shorts showcasing shapely legs.

"W-w-what?? Are you crazy?? I'm not turning into a sissy!" you stammer, trying to sound indignant even as your stiffening cock betrays your true desires. "That's so fucking weird!"

But she just laughs, the sound rich and throaty. She saunters closer, hips swaying enticingly.

"Oh I don't know, I've seen the way you look at me, at my clothes… You want to be just like little sissy me, don't you? Dressed up in cute outfits, sucking cock like a good girlie boi…" she purrs suggestively.

She reaches out to trail a finger down your chest, her touch electric even through your shirt. "Be honest big bro… Doesn't the thought of being my sissy sidekick turn you on? Chugging cum together, our mouths stuffed with thick dick… I bet that's what you really want, deep down…"

She leans in close, her breath hot against your ear as she whispers. "So what do you say? Want to be a good sissy for your baby sister?"

You realize that she had already started… she had talked to in going to that Halloween party in drag. At the time it had all been for a laugh, but the panties and stocking had felt really nice… Secretly you had enjoyed it… even if you are a big jock stud.

"Look I'm straight… I like girls… You know I'm dating Jenna." You protest weakly as she just keeps talking you into it, pointing out how good you had looking at the party.. How all the guys were wanting to dance with you… and after you had gotten drunk you had made out with a couple of them…

Your sister's grin widens at your weak protestations. She slides her hand lower, palming the growing bulge in your pants. "Straight? I don't think so, big bro. Not after I saw you going to town with those frat boys at the party. You loved having their hands all over you in that tight dress."

She gives your crotch a firm squeeze, making you gasp. "And I saw the way you preened when I told you how cute you looked. You want this. You want to be my sissy slut."

Your cock is fully hard now, straining against the fabric of your jeans. She rubs her palm against it, coaxing out a bead of pre-cum that seeps through the material. "Fuck, you're leaking already… You're so horny for becoming a sissy aren't you?"

She leans down, licking your ear as her fingers work open your fly. She reaches in, grasping your hot shaft and stroking it slowly. "Such a good sissy, getting nice and wet for me… I bet your girlfriend wouldn't appreciate this, would she? Seeing my sissy boy with his legs spread, begging for cock…"

She pulls your cock out fully, the thick shaft slapping wetly against her palm. Your hips jerk upwards, fucking into her tight grip. "Nngh… I'm not…" you try to say, but it comes out as a moan.

"Yeah you are," she hisses, pumping you faster. "You're not a straight jock, and you're closeted sissy jock. You're my sissy. And you need to accept your place."

You shudder and shake your head as she strokes your cock, her words sinking into your mind as you try to deny your own desires. "No… no… I'm not… I'm not a sissy…" you protest weakly, even as your hips pump up into her stroking hand, seeking more stimulation.

"I'm not a sissy… I like pussy, not dick…" But deep down, you know its a feeble protest and she's right. The memories of that Halloween party flood back… the way it felt to grind against those guys as you danced in the dress… the thrill of having their hands on you… the heat in your crotch when she called you a sissy and you realized she was right.

Your sister's hand keeps pumping your thick shaft as you protest, smearing the pre-cum oozing from your tip all over her palm. She uses it as lubricant to slickly stroke your cock. "You say that but your cock is telling a different story, baby bro. It's hard as a rock for me. For your place as sissy slut."

She leans down, flicking her tongue over your leaking tip, tasting your essence. "Mmm, you're leaking so much pre-cum…you must be so deep in the closet, so repressed. But I'm gonna bring out your sissy side. I'm gonna make you accept what you are."

Her grip tightens around your throbbing shaft and she pumps you faster, twisting her wrist on the upstroke like you've shown her. "Your mouth says no, but your body is saying yes, yes, a thousand times yes," she taunts, her fingers teasing your swollen cock head.

"Mmm, and I saw how you looked at the guys at the party. The hunger in your eyes as they groped you. You loved it when they grabbed your ass, didn't you? When they slid their hands up your thighs and under your dress, feeling your silky panties… while your junk was tucked and taped."

She leans down, her warm breath ghosting over your ear. "You're not fooling anyone, sissy. Not anymore. I'm going to make you my sissy slut."

Her other hand slides under your shirt, claws-like nails raking over your chest and stomach. "I'm going to train this sissy body of yours to crave only cock. You'll be my good sissy, won't you? Serving me and all my friends. Being a sweet little whore for the boys."

She bites the curve of your neck, sucking a dark mark into your skin. Her fingers tighten on your weeping shaft. "You'll beg me bring to cocks to serve, beg me to get you fuck your sissy boi-cunt. Because that's what sissies like you are made for. To be filled with hot, hard, thick dicks. Aren't you my sissy?"