Usotsuki to Hatsukoi

Izumi realizes from a young age that his romantic orientation is toward the same sex. Even when he becomes an adult, he hides that fact and pretends to be like everyone else.

One day, on his way home from a business dinner, he gets embraced by a young man who exclaims, "It's you, Kou-kun, isn't it...?! I've always wanted to meet you!" The guy in question is his friend he had lost contact with eight years ago, Shion, who is also the boy Izumi felt guilty toward for being attracted to, and whom he distanced himself from all those years ago.

Questioned why they suddenly lost contact, Izumi blurts out that he always loved Shion, to which Shion replies that he feels the same. They end up dating, and they're lovey-dovey and happy, but sometimes, Shion's behavior seems off...

(Source: Kasakura Shuppansha, translated)