This is the OVA from Koisuru Boukun, based on the manga by Takanaga Hinako. I do not own this, all credits go to the original creators. Enjoy!
Being in love with your not-gay sempai isn’t easy, but being in love with your not-gay, homophobic, and (to top it off) tyrannical sempai can be hell! And that’s something Tetsuhiro Morinaga can relate to… especially now that he’s had a taste of the forbidden fruit!