I (23M) turned into one my friends (23M) stress reliever

Everything started like a year ago (when I was 22) during this one night (kind of a sleepover) with like 6 of my friends (ALL of us men and 22 years old too).

We were having a nice time, catching up with each other while having drinks. After a couple of hours we suddenly started to “split” into tiny groups for some reason (probably the main conversation dying), so I went with my best friend to keep hanging out with him.

We where at his house so we both went to his room to you know, get more privacy (good to mention that we didn’t think about something lewd till this moment).
The point is that things escalated quickly, we started to open ourselves up to each other, when he suddenly confessed to me that he’d like to see me wearing feminine clothing (like a femboy) due to my body not being that toned and masculine.

Idk why but I suggested trying some clothes since that’s what he wanted (I was probably driven by the tension of the moment but whatever).
He just nodded, reached to his closet, pulled out some black latex bikini with elbow high gloves and thigh high socks, and then asked me to put the outfit on.
I asked why did he have that, and he just said his ex girlfriend (also 22) left it a while ago.

The heat of the moment consumed my mind and I put it on, after that, the only thing I remembered was feeling the tightness of the outfit as he pounded me like a little slut for maybe all night long.

I woke up laying on his bed next to him, with back pain and a bunch of semen streaming down my asshole.
I asked what happened, he put me in context with a recording of the act, showing how much I enjoyed it and how I agreed to it.

I deeply blushed but then agreed to keep it as a secret between us (luckily, our friends didn’t hear anything and by this time they already left the place).

Weeks later, I couldn’t stop thinking about it and went to my friend’s place again, and ofc, we ended up doing the same.
Things kept going, with me trying new slutty outfits and ways of pleasing his cock to the point where I visit him like 3 days a week to do our thing.

Whats even best? (Or worse, depending on how you see it), he seems to know the power he has on me now, and he sometimes role plays and calls me his “good boy”, “pet”, etc… but i don’t regret it or dislike it.