Something dawns on you- you're thinking about guys having sex with you, about servicing them, about getting fucked, but not about doing that to guys yourself. You kinda want men to... "ohh..." you say aloud as weird thoughts and desires race through your mind.
"What's up?" your former boyfriend asks.
"I've realized what's happening," you say. Undressing, you stand in front of the mirror so you can watch your changes like he watched his a minute ago. His eyes gaze at you hungrily as you explain. "I don't think I turned gay, I just want to men to fuck me. And I want men to fuck me," you say as you get naked and focus on your nude form in the mirror, "because I want to be a woman."
He watches from behind, both of you transfixed by your body embracing womanhood. Your facial structure softens and your hair lengthens halfway down your back. You lose some muscle definition and a few inches height, and your shoulders narrow while your hips flare and your torso tucks inwards. All the while, the feelings of attraction to men, especially the man behind you, continue to feel more and more natural. Your skin softens and most of the hair across it vanishes, and you see your nipples enlarge and feel them grow sensitive. As you breathe heavily, your chest slowly sprouts two soft C-cup breasts. By now, you look like an attractive young woman with a penis between his- no, her- legs. Just to reaffirm your new gender, you watch as it shrinks back into you, as do your testicles, while your sac becomes nearly flush with your crotch and forms a slit inside it. Your penis has receded to a tiny but intensely sensitive nub, your new clitoris.
You smile cheekily at the man stood behind you, and as you see his rock-hard cock you feel female arousal for the first time. You feel your nipples and clitoris turn erect, and your newly-formed vaginal slit is already moist. You ache to have him inside you. It feels right.
He grabs you, enjoying his unfamiliar strength, and pushes you eagerly to the bed. Once he moves upwards and grabs his shaft, you grin and spread your legs. Neither of you cares about anything beyond satisfying your newfound sexual instincts at this point- he wants to fuck you up with his cock, you want him to fill your aching pussy, and a part of you even wants him to get you pregnant.
You gasp as his the tip of his cock rubs your clit, realizing how small and sensitive your former shaft has become. Once he moves it down and inside you, you feel an exquisite warmth spread through your body as he rails you. Occasionally his shaft hits a point deep inside you and you feel like your mind is going blank, or he'll grab at your soft boobs and you moan uncontrollably at the combination of unfamiliar pressure and the virile firmness of his touch.
Both of you cum almost at the same time, your body clinging to his shaft as he shoots his seed inside you forcefully. You kiss each other messily while you come down from the high, and both fall asleep with him still inside you. When you wake up...