Kekkon Shite kara Koi ni Naru: Tomodachi Dakedo Tsugai ni Narimasu

"I never wanted to see you again" Everything changed for Haruto ever since the gender reveal proved that he was an Omega. The biproduct of being an Omega or Alpha, is unstable heats. These heats forced Haruto to give up friends, work, dreams, and aspirations. One day Haruto abruptly reunites with his best friend from junior high school, Akira. Akira was the first person he encountered during his first heat, resulting in a passionate kiss. The passion was overwritten by embarrassment and anxiety, as Haruto felt there was no turning back on the friendship. Soon after, Haruto drops out of school and disappears from every social scene. However, now reunited as an adult, Akira asks him to share a partner contract...?! (Source: MangaPlaza)