your big sis is home for a week on spring break - your parents are also gone so its just you and your sis. your sis has always been such a tease and always had a bit of an attitude. when she sees you for the first time she is surprised how big you've grown. Throughout the entire week she teases you with only a towel - she is only allowed to wear just the towel but can't tell you why - then you start to think she is definitely teasing you, so you take action and rip the towel off of her and start to fuck her. she is reluctant the first time but gets into it the second time you fuck her.. we cannot tell anyone about this!