Seems Tenryuu got really fed up of Tatsuta's constant trolling so it was time to turn the tables... Although I am not sure what happened to Tenryuu's breasts. Are they blocked by her arm or did the artist forget to draw them in?
Pre-post edit: This seems to be a genderswap because I ran the commentary through google translate and it said something about Tenryuu-kun... so I assume she got a genderswap. I won't tag it as a genderswap until someone with proper japanese knowledge can determine what's going on. That would explain the lack of breasts.