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So weird because I just saw this yesterday on mrm. I can’t find any eng translation of it though - https://myreadingmanga.info/unknown-unknown-senpai-to-jp/
Thank you! So that's why i can't find it XD i'm searching with english tag hehe
They are 3 friends, 2 of them are a couple. This one friend if i remember correctly blackmails the uke,
Then there's this camp where the friend and the uke did it inside the car before going home while the seme is just outside waiting for them (he doesn't know whats happening inside)
At the end the couple rented an apartment beside the friend's apartment, the seme left and watched a porn in their apartment leaving his uke and the friend, so they did it again. Kinda like ntr.