there's a missing tag, but i don't know what it should be. cos i have been using my brain so hard reading this at 1am, but i still don't get shit why the senpai wants the sensei to forget him while they are crazy in love.(〜 ̄△ ̄)〜
He probably felt guilty about leaving him in high school and felt that if the uke(Sensei San) got over him, he (the uke) could find someone much better than him(the senpai)
KE is soooooooooooo cuteeeeeee ~~~~~~~~~~~~~~~~~~~ (Ye Zi and Gao Hang bed scene) HOLD ME TIGHT, PLEASE. I'M GONNA FAINT. -NOSEBLEEDING- ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄
http://www.mangago.zone/read-manga/sengoku_komachi_kurou_tan/mrk/m_chapter-1/32/