'I want us to swap genders,' Amanda said.
My heart leapt into my throat as what she'd said sank in. 'So... you want to be a boy and me to be a girl?' I replied shakily.
'Please,' Amanda replied. 'I've been having weird fantasies lately, like I want to have a cock and fuck girls and make them pregnant. We can change back right after, I promise!' she added apologetically.
I had to admit, turning into a girl did sound pretty hot to me. 'OK, we'll do it,' I replied, looking at the ring and taking a deep breath. 'I wish Amanda would turn into a boy and I would turn into a girl.' Just to lighten the mood, I added, 'Oh, and I wish both of us would be naked again.'
Amanda laughed as our clothes vanished. 'You perv!' she said firmly, both of us trying and failing to not look at each other's body.
'Well, it doesn't really matter. Anything we see isn't gonna st-' I started to reply, a weird feeling cutting me off. I could tell from her face she was experiencing something similar. For me, I'd just felt my balls pull up inside me, and realized they were starting to reshape into ovaries. A moment later I realized what the feeling had been for her- the slit between her legs had sealed itself up and her body convulsed as she seemed to be pushing something downward. I saw the new sac between her legs take something inside of it, and then bit my lip to avoid a moan as the space between my legs opened outwards, a passage forming inside me.
Our bodies were quickly becoming mirror images of what they had been. When her chest shrank, I felt my nipples perk up and flesh bloomed from me to a similar size as she had had. Her muscles grew thicker and her figure straighter, while my body became lithe and my figure curvy. Her clit rapidly poked out from above her new balls and expanded several inches, while my own cock sucked back inside me, sensitive feelings intensifying around this increasingly tiny nub, and I felt female juices start to build up around my slit as I saw his new, masculine form.
As the changes finished, the last big ones affected my memories and sexual feelings. I wasn't Joey anymore, I was Josie. The guy in front of me wasn't my girlfriend Amanda, it was my boyfriend Manfred. And I didn't want to fill up pussy with a big thick cock, I wanted to get my pussy fucked and have my tits pleased and be filled with cum.
Looking at Manfred's shocked but aroused expression, I could tell he'd had similar revelations and wanted to act on him. Instinctively we kissed passionately, and he carefully pushed me to the floor with his strong muscles. I moaned and my body sang as his hand cupped my breast and massaged my nipple, and feeling his firm 7 inch shaft against my thigh, I spread my legs.
'You said you wanted to get girls pregnant, didn't you babe?' I purred. 'Now's your chance.'
He barely hesitated a moment before pushing his cock between my soaked lips. It was literally the best sensation I'd felt in my life to that point, the intense closeness and warmth to his body felt perfect, even more so as his hands on my chest and the start of his slow pounding pushed me to even greater heights.
Our fertile bodies thrusted at each other, fixated on nothing but mating, him on impregnating me and me on being impregnated by him. All the sensations- feeling his firm fingers caress my boobs and sensitive nipples, his shaft filling me and his balls slapping me over and over, and hearing his low-pitched grunts and pants and my high-pitched gasps and moans- reasserted the reality of our new roles to me. I had been male and now was female. I had been emasculated, my body remade to be impregnated rather than to impregnate, and it was a price I was more than happy to pay for this level of pleasure.
Finally, I felt his shaft twitch and realized he was a split second from cumming, and in response I finally peaked. I clenched around his shaft tightly as his seed pumped through his cock and rapidly shot deep into my pussy, not a single drop sliding out of me. Within my womb, his semen quickly found and fertilized my egg, and knowing this, we kissed eagerly, our bodies staying connected even having finished our lovemaking, both of us surprised at how readily we had adapted to our change of roles.
'I've gotta admit,' Manfred smiled as he broke off the kiss, 'you make a beautiful woman.'
'Well, you're a gorgeous man,' I replied teasingly.