As you rummage through the pile, a pair of black lacy panties calls out to you. You find yourself holding a pair of what you'd describe as sexy lingerie. The thing is, you would normally find these sexy on a partner, not yourself! You can't resist though, as you grab the underwear out of the pile and put it up your legs. As you do, the shelf of underwear disappears, sliding back into the wall of the white room.
You feel a sudden sensation in your legs, under the lacy panties. It's icy cold, but at the same time it's giving you immense pleasure. You reach for your cock, but as you touch it it stings. You let out a gasp as the pain jolts through your cock, and stops at the base. You can feel your cock shrinking! You pull down the panties slightly in order to see, but as you do the pleasure sensation stops. You look down in fear as you realize what you've been feeling is true. Your cock is just a little nub, and it's shrinking down and down, until it inverts into your body. You see the newly created hole and have only one idea on what to do.
You take your finger, and moisten it with your saliva, before sticking it in the new hole. You feel intense pleasure from this sensation, even more than you felt from having the panties on, and you wriggle your finger back and forth as your new vagina is formed. You watch as the pubic hair you've previously had and ignored trims itself into a neat little triangle and turns a bright red. You don't even care to acknowledge that this is weird, as your pleasure from masturbating with your new parts is too much. Suddenly, you cum and it feels amazing.
You pull the panties back up and you see the shelf come out of the wall again with a new item..