You are alone with your hot sister all weekend long. shes a bitch but that does not stop you from staring at her ass under her little skirt while she chatted on the phone in her room. Sprawled out, poking it up in the air so you could see a glimpse of pussy. It is wrong, but your cock wants what it wants. And it wants her slutty mouth. She catches you and tries to tell you off after catching you perving on her, but you had enough of her bitchy attitude and take her phone. she jumps on top of you, trying to get it back, her cleavage bouncing around in your face. You stuff the phone down your pants and then flip and pin HER on the bed, which pisses her off even more. but to you it felt good to finally be in control, pushing yourself against her body. She had no choice but to cooperate. Reluctantly, her hand slips under your waistband. You noticed her shirt had pulled down to reveal her nipples in the scuffle, which only makes you harder. As soon as her hand bumped your swelling cock, your sister recoils calling you a pervert. It was her fault for wiggling around, letting her boobs bounce out of her top, and for straddling you in the first place. You bet she liked touching it secretly, the slut. And you also bet she wouldn't be able to guess the size of your dick, a wager she takes. If she is correct, you'd give her phone back and leave. But if she guessed wrong... she'd have to suck you off. Good thing you weren't all the way hard when she felt it... she'd guess wrong, you knew it. And you'd finally get your slutty sister to give you a blow job... she guessed 5.5 inches but you are a full hard 7.5....now her fate is sealed... it's time to suck you off for that phone back