You awake lying on something, front side down. You can see your torso, that you're in a red tinted but strangely bright membrane, and that you're bound with your hands tied at the top of it and your legs at the bottom, but little else. Furthermore, your mind is clouded by the pheromones in the pod... they're so strong... you see and feel your penis stir and harden rapidly.
A slim tube pushes out of the bottom of the pod and moves towards your hard cock. You don't know what it is but you know primally that you want it. There's something primally attractive about it, like a breast. As it touches, and then pushes into, the head of your cock you gasp in pleasure. You feel it start to suckle you, forcing your shaft back and forth, pumping hard.
It feels better than anything you've ever felt- better than any sex ever. You let out a high, almost feminine whimper as you cum, the tube perfectly affixed to the inside of your cock to catch every drop of your seed. But that's not enough for it- its hold tightens, it tickles. It wants to MILK you.
Your ejaculation- and euphoria- seem to last ages, as it sucks up every last drop of white sperm from your balls. You should be drained, but the pheromones in this pod are affecting your brain. Your pleasure centres aren't exhausted, just changed. You suddenly realize you can feel your scrotum pulsating. The tube pulls out of your shrinking penis and begins to rub along the indent of your balls. You let out a high-pitched noise as you feel the loud 'pop' of them moving inside your body.
At the same time, you realize your nipples have become very sensitive. Two more tubes emerge from the pod and rub at them more, causing them to turn erect, before pushing gently inside the new tiny openings of them, starting to squirt some kind of hormones inside. You watch as they swell up and push out, the rest of your body slimming and smoothing out to accompany them.
At the same time, you realize the space between your legs is also receding. Your penis is thinning and shrinking before your eyes, and the continuous rubbing of the skin of your sack has reduced it to a small mound. All of a sudden, you grunt as your vaginal tract and womb form inside you, with your former testicles sliding into place, becoming ovaries. The tract pulsates and begins to open a path down from your womb to your slit, opening you out and causing you to moan audibly.
You're a woman now. Before the enormity of this even sinks in, you see the tube which went between your legs thicken and swell until it takes on a very familiar shape- a very phallic one.
Your slit moistens in anticipation.