You and your sister are sat on the sofa watching TV. Sister is wearing a skimpy little top showing her tits, and a tiny pair of booty shorts. There's nothing on TV and your sister is getting bored, but she has an idea to keep her entertained. She knows you look at her, and your cock twitches whenever you see her tits jiggle or her ass shake when she walks by, you're going to wank your cock for her, otherwise she will tell mom what a pervert you are..... be a good brother and jerk your cock over your sister