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Is this the manga you're looking for?
http://www.mangago.me/read-manga/ten_count/
http://www.mangago.me/read-manga/otokonoko_no_koto_wa_nani_mo_shiranai/ Here! It’s chapter 3. Also pls read the other mangas from the author. They’re really good!
Looking for a manga
Ok, so the uke is like a clean freak and the seme is popular.(I think) the uke let the seme borrow a pen and then the uke throw it away because of germs and later went to look for it and the seme helped.
Going into a the few chapters, the seme cuts his hand and the uke faints onto his school desk.
Sorry for the vague info, I haven't read it in a while, ... obviously