are you thinking about 10 count???
You mean KnB DJ? No, it was original series, but I don't remember the title, sorry!
that is ten count from wht i remember
https://www.mangago.zone/read-manga/ten_count/
this one right?
Ohhhh, yeah! I thought it was a volume- or two-long series, but it has 48 chapters, haha
Ch.13 reminded me of that yaoi manga in which the psychologist borderline raped his mysophobic patient with OCD (he would wash his hands until they would bleed, for example).