TVR/Andrew/Bedroom/Wank
You start sliding your hand up and down. It's been a long time since you shared a bath, so you've no real idea of what Janet looks like naked. You know she hasn't got any tits yet, but you wonder if she's started growing hair like the women in the magazines that get passed around school.
You look up at the pictures pinned to your bedroom wall; Diana Doors, and Jayne Mansfield; both in provocative poses and showing a good deal of cleavage, but somehow their big tits don't seem to be so sexy any more, so you close your eyes and try to remember what Janet looked like the last time you saw her naked.
She would have been about four years old, and at the time, you weren't best pleased at having to share your bath with her. You remember that she was looking at your cock and asking questions about it, like "what makes it go stiff?" At that age, you didn't really know, but even then you knew that sliding the skin up and down making the head pop in and out, just like you're doing now, made it feel good. Janet said it wasn't fair that you had one to play with when she didn't have anything and she'd spread her legs apart underwater to demonstrate.
You wonder if she's learned about masturbating yet and then, in your imagination, your stiff cock is sliding in and out of her little pussy rather than your fist and it isn't very long before you have to grab a tissue to catch the jets of white spunk.