Responses
Could it be this, Sensei Shokushin Shite Kudasai?
https://www.mangago.me/read-manga/sensei_shokushin_shite_kudasai/
beta
There was a manga about a construction worker who wanted to try anal and he tried with Ana object and that got stuck and he went to the doctor to get it out and while he was at it he asked where his prostate was and slept with him and both ended up in a fuck buddy relationship till the construction worker caught feelings and tried to end thing didn’t work and they ended up together