Some criticism/suggestions/general comments (feel free to ignore if you'd like, I just think these would make the fights more interesting):

Try and keep to a single tense! You have a tendency to drift into present. It's not that big a deal, but it would make the fights a fair bit smoother to read if you kept to one or the other.

I really enjoy how you describe each of the fighter's bodies near the beginning, and give a legitimate reason for them to be naked. It's a nice touch. Personally, I think it would be cool if they had a little more variance in body type and genitalia, but that's just me.

Speaking of genitalia, it would be rather nice if being nude could have more of an effect on the fights? You do describe breasts jiggling and nipples hardening from time to time, which is great, but I'd enjoy a little more.

All that being said, I do really enjoy the concept of this series and all of the fights that have occurred so far. Keep up the good work!