It’s no good, you REALLY have to scratch your itch, you just can’t do it right now because you're barely hanging on to the train as it tips over for one last time. The wind and G-force caresses and presses against your body like an experienced masseur, sending mind-numbing waves of pleasure across your entire body. Eventually the ride comes to a halt and you can safely get out and satisfy your urges.
You unzip your fly, take off your pants and stroke your crotch, as you do so your chest breasts and nipples disappear and your balls wither and die, your scrotum inflates and turns pink and your penis splits into four and become pink and elongated. As you stroke your new penises a thick white liquid comes out of them, but it is not sperm but Milk.
“OH NO!” The inner part of your mind thinks to yourself, you’re in danger of turning into a female reindeer, your scrotum is now an udder and your penises are now your teats. This is evident as the liquid leaving them is milk and not semen, you REALLY have to get off of this island or your might fully transform into a female reindeer, body, mind, and soul. But “OH IT FEELS SO GOOD” the outer part of your mind thinks.