Ashita, Kirai ni Naritai

Unremarkable and plain, high school student Touma is sleeping with his popular childhood friend, Yuusei. But—they are not lovers. At school, Yuusei acts like they’re strangers, refusing to even meet Touma’s eyes, as if he doesn’t want to be seen with him. Despite this, Touma, who harbors feelings for Yuusei, is happy to sleep with him. Yet, weighed down by the guilt of having hurt Yuusei in the past, he suppresses his emotions. However, one day, Yuusei suddenly and forcefully invites Touma on their first-ever date—!?

(Source: Frontier Works, translated)

Note: Includes an extra chapter.