Humor her. Strip down to your boxers and try on the clothes she picks out.

You sigh, when Abbie gets her mind on something, she gets really adamant about it, and won't take no for an answer. You figure you might as well go along, and let her pick our your clothes for the night. After all, maybe you'll look good to girls if you let her dress you. It couldn't hurt.

You push your jeans down and kick them off. You stand in your boxers, watching your sister dig through your closet. "Hmmmph... not a lot to work with." She says to herself. She turns around with a pair of black jeans and a white buttoned shirt in her hands. "This is a classic look," she explains, as she hands them to you. "If you dress up a little, you won't look like you're still in high school." She looks up at you and her hands trace over your bare shoulders. "At least your height helps out there." Her fingers trail lightly down your arms. She steps back watching you closely as you pull the jeans on, and button the shirt.

She rolls her eyes and shakes her head. "You have to tuck it in, Stretch." She says, stepping close to you again. She starts working the tail of the shirt into the waistband of your jeans. Her hands push down over your ass cheeks as she tucks the shirt in in the back. When she shoves the shirt down the front of your jeans, she suddenly grabs your dick. "Mmmm... Some lucky girl's gonna get this tonight." She laughs.

You jump when you feel her fingers grip your cock through your boxers, and pull back from her quickly. "Fuck Abbie! What's wrong with you today?" You stare at her wide-eyed.

She smirks at you. "Lighten up, beanpole. You need to get used to getting groped by girls if you're gonna look and smell this good." She snickers. She leans in closer to you. "There'll be some drunk chick at the club doing it, I guarantee. Or you could just stay home and I'll do it. Which would you rather, bro?" She winks at you.

"You are fuckin' weirding me out, Abs," you tell her.

Abbie shrugs. "Your loss. Most guys like it when I grope 'em." She steps back to look you over, her eyes seem to linger on your crotch. "Yep... you're looking good. Now I've gotta pick something to wear. Come give me a guy's opinion." She grabs your hand and pulls you towards her room. "Do you think I should go for cute, or slutty tonight?" she asks, as she pulls her top off over her head and drops it. She's not wearing a bra. She starts looking through her closet topless in front of you.

"Damn Abbie, I don't think it's normal to just flash your boobs at your brother," you complain, holding up your hand to block your view of her tits, and trying not to look directly at her.

She smirks, "Relax, would you. I mean, we used to take baths together." She holds up a crop top with a high neckline in front of her, it would show off her toned belly. "So... cute..." Then she moves it away, giving you another glimpse of her perky tits, until she holds up a different top, this one sparkly and backless, with very low neckline, "...or slutty?" she asks, "Which one turns you on more?"

That's when you hear your mom's car pulling into the driveway.