Koisuru Boukun is my absolute favorite BL manga. Senpai and Morinaga are too perfect together. Senpai is very reluctant to have a relationship with Morinaga but at the same time, he can't deny him because deep down he likes him. We haven't seen him fully accept what they are doing but the longer he's around Morinaga, the more troubled Souichi senpai gets. 10/10 would recommend if you haven't read it already!
Bring on the smexy!