A few months ago, when your boyfriend told you he signed up for the gym, you didn’t think much of it. He seemed motivated to do it for health reasons, which was hard to argue with. You really didn’t expect that he’d have much in the way of results, most people don’t.

He would happily text you about his progress, and you were happy at first just to see that he was committing to this new project and encouraged him as his loving, supportive girlfriend. It wasn’t long after that you felt the changes for the first time yourself. You were on the couch, cuddling and watching TV. Your hand touched his chest, or your head rested on his bicep and it felt firmer than you were expecting. Curious, you gave it a little feel and the muscle was actually still there. It gave you a little thrill, though he seemed a bit oblivious to it at the time.

As you watched him get undressed for bed, your eyes picked out little details, more definition in his body. “Um… do you want to…” you asked, biting your lip. He smiled and climbed into bed with you.

A few weeks later you could see more changes, even with his clothes on. Your boyfriend looked burlier and stronger and it excited you. Surely it wouldn’t hurt to help him along…

This prompt is rooted in some recent real-life experiences I’ve had with female friends reacting to my gym progress. It has been very flattering and exciting, so I thought I would try to turn it into a prompt. The basic concept is a quite average man starts working out and the transformation he experiences is encouraged, enjoyed by, and maybe accelerated by his friend/girlfriend/wife/taboo pairing person.

While muscle growth is the obvious change here, I also thought penis/testicle growth could be included and even minor height growth. As for her influence or helping him get bigger, I’d rather not just use generic steroids since those have obvious health implications. Maybe she has access to a drug to increase testosterone production or triggers a growth phase or something like that.

This could come along with some personality changes, like maybe he gets more dominant with your character as he feels more assertive. All that added testosterone would surely mess with his sex drive. Nothing too rough or mean though.

I figure the story might follow her growing interest, his changing body/personality, and the fun antics they get up to. If you’re interested, please send me a PM (I prefer that over chat) with your ideas for the RP. I prefer long-term roleplays. You can find my kink and limit list on my DPP Profile, as well as lots of other prompts.