You sit there on the thick cushions, eyes closed, with the woman touching your newly formed female nethers and you playing with your own breasts, thinking of how you were a man not long ago, and now you are experiencing sensory stimulation you could never have imagined. Your whole body pulses with pleasure and you stifle a moan or a gasp every few seconds. After some time, you open your eyes in time to see the woman, with her free hand, grab a long purple object from another cupboard hidden behind a cushion on the wall. In her eyes, you see hunger and even malice.
Part of you knows you should get up and do something, but you are enjoying the moment so much that you close your eyes and lean your head back, trusting that the woman knows what to do with the female body. To your surprise, the woman removes her hand from between your legs, and when you look at her, you watch her take the long purple object and plunge it into your vagina.
Your eyes go wide. You can feel yourself stretching wide to receive it. It is uncomfortable and wonderful all at the same time. For a moment, you forget about touching your nipples and stare at the ceiling without breathing. You can feel the woman working with something at your legs, but the sensation of being penetrated is so overwhelming that you can't focus on anything else. As it wears off, you look at the woman and narrow your eyes.
The object had more to it than the purple dildo shaft. It has a box at the bottom - a motor to push it in and out - and straps, both of which she has synched around your upper thigh, so that the dildo is held in place and you cannot escape it. You've never done more than flirt with BDSM but something about this situation turns you on. The woman flicks on the motor and the shaft begins pumping. For the first few thrusts, it just feels like warm shivers, but the longer it goes, the more pronounced the shivers become.
"I think you stopped transforming," comments the woman, "because I didn't get all of your human aura. So I will extract it from you now, and that means more changes for you and for me. I'm going to enjoy this!"