2T4U/Jack/Tiffany's room/Jerk your prick against her crack
You take your prick in your hand this is just so wrong, you are jerking off over your bare-ass 3 year old sister while she innocently masturbates. You just can't help it, you have to feel your dick come into contact with the toddler's “intimate places.” You grab her hips with one hand and bring your dick down to touch her just between her ass-hole and her immature vaginal entrance. Her body seems to jerk before you can get any better alignment and she glances back over her shoulder. Suddenly, she rolls her entire body out of your hand and sits on the floor, looking at you with her legs spread wide and her little pussy facing you.
“Hi Buba,” she says, having somewhat frustrated your attempt to get off for the immediate time being. Well, not that this would really bother you. She is a normal human being, not a mindless sex doll.