Hinekurebana ni Ai wo Sosoide

When Kyousuke was heartbroken and getting drunk at a bar, he was invited by the refreshingly handsome Touma, and they ended up spending the night together in a drunken mood. However, the next morning, Touma confessed that he's been watching Kyousuke for a long time. Knowing that Touma is younger than him, Kyousuke, who likes older men, ran away from the place. But no matter how many times he rejected, Touma continued to show his straightforward love, and drove Kyousuke crazy.

(Source: Core Magazine, translated)