You think for a moment. If a succubus took your soul, it'd destroy who you were, right? But if you give it your maleness, you just become a girl. You figure living as a girl wouldn't be too bad. You could look however you want, make closer friends, stand up against the norms of society, but most importantly, you could have BOOBS!
"OK, you can take my manhood, I guess," you tell the succubus.
She licks her lips and sighs in pleasure. Suddenly, her eyes glow blue, which cycles through purple to pink. You realize what it's symbolising, but for a minute, those eyes hypnotise you. You can't look away from them... they're so beautiful...
Suddenly, you feel all warm and tingly, all over your body, but especially around your chest and between your legs. Your clothes vanish and you're suddenly standing in front of the succubus totally naked.
The feelings overwhelm your body, and you breathe heavily as you feel your body shrink in on itself, a subtly curvy figure developing in your torso. Your skin softens and smooths, and you feel all the hair on your body besides that on your head and crotch recede away.
Your arms and legs thin and become more shapely and elegant, and you can feel tiny tingles in your face indicating it's reshaping into a more feminine one, your hair lengthening and your butt gently swelling into a curvier, gentler shape.
Then you feel tension building in your most sensitive places. "Nnnnn..." you moan as the pressure on your chest builds, first in your nipples swelling into actual teats, then in the flesh around them expanding into two C-cup mounds. Your length is intensely aroused from this.
"Ah! Mmm!" you yell in pleasure as your cock spasms as if cumming, while at the same time you feel your testicles pinch up tightly. Two wet 'pops' indicate they have moved inside your body, whilst your cock shrinks smaller and smaller, becoming more and more sensitive, until it's so small you can barely feel it- but oh, fuck can you feel it. You realize this pencil-eraser sized nub is your new clitoris. The remaining loose skin begins to form lips and folds in a feminine shape.
The feeling of your testicles curling up, sliding into place and forming ovaries, along with the new internal organs forming in your belly and crotch, are surprisingly pleasurable, as you finally feel your skin split to form your vaginal tract. You're wholly a girl now, and there's no going back.
Suddenly, you hear the succubus making noises of pleasure. "Oh," she moans aloud as a nubbin of flesh protrudes just below her stomach. It extends for about 6 inches and bulges out into a bullet-shaped tip, before the skin below stretches to allow two round lumps to drop down on one side, then the other.
You quickly realize it's a penis. Except not just any penis. It's YOUR penis.