The best thing about being seventeen is having a sister. No, seriously!!
My sister is thirteen and I must beat off with her panties and bras at least three times a week. I just go into the hamper (or her drawer) and 'borrow' a pair anytime I feel the need. Mom lets her buy thongs (YES!). She is really tiny in the chest department (A cup) and I know she has pubic hair. I find them in her panties all the time. Sometimes I check just before bed and have kept them all night. Sometimes I slip them on, maybe rub a little pre-cum in the crotch and then fold them up and put them back in her drawer. She doesn't have a clue I do this.
What do guys do that don't have a sister??