Kocchi Muite Aishiteru

Kou's high school friend, Daiki, contacts him for the first time in nine years and they decide to meet. Even though they had become estranged after Kou rejected Daiki's confession a long time ago, Daiki tells him that he still loves him. Kou has no intention of responding to his feelings, but after thinking about it, he proposes to be his sex friend and he accepts...

(Source: Kadokawa, translated)