Flaver
It seemed like a love/hate relationship. A very weird dynamic
Wonder Border
Both the uke and seme cheat on their partners with each other. But both have a long history with each other and were each other's first loves and could not forget each other. It's a story of fate and Destiny and how they both tried to move on but couldn't. Yes, they could have come clean to their partners earlier but guilt especially on the uke's side silenced him. Eventually, the uke just couldn't forget how strong his feelings still were for the seme and although he tried to move on from him, he could not and he broke off with his partner telling him everything.
Bokura ga Koi wo Ushinau Riyuu
Uke finds comfort in a frequent bar customer, first as a friend to confined in, about his unrequited love for his childhood friend who is straight, who is moving nearby (within walking distance) in Tokyo. Things slowly develop as the uke and the new friend/seme slowly learn more about each other, especially the uke who was unsure of even his sexuality. Things come to a head as he and his childhood friend go back to their hometown for a visit and all the uke thinks about is the seme
Ore no Oniku-chan