Kirei na Ojisan wa, Suki desu ka.

One day, Makoto is suddenly confessed to by a high school boy, Shun-kun, and Makoto spontaneously gives him his contact information. Unable to tell Shun-kun that he is a "cross-dressing older man," Makoto is wracked with feelings of guilt. However, as he deepens his relationship with admirable and pure-hearted Shun-kun, Makoto realizes his feelings have changed...? How will the love between a beautiful older man and a high school boy turn out?

(Source: Kodansha, translated)