You feel compelled to put on the panties, but they are way to small for your adult male legs and get stuck at your knee's.
You slide the silky pink things back down and start to jerk yourself off with them like a glove, while playing with your now sensitive girls nipples with your other hand.
It's the most intense sexual pleasure you have ever felt you, don't notice that other parts of you have started to change as you shrink from 6 foot of muscle to a delicate petite 12 year old girl.
Your shaft now feels massive in your tiny hands, you feel you are about to cum, "yesssssssssssssss arrg nmmmmm", you scream out as the sensation is almost unbearable pleasure as your penis shrinks down and pushes in to form your tight little vagina and you experience your first female orgasm.
Your sounds must have alerted someone as the door opens while you are still just in your bra and in walks........................