Inaka de Hiyake Otoko no Ko to Asedaku ni natte Yarukoto Hitotsu!

The protagonist, who has quit his job, goes to his uncle's seaside inn to take a break...
There he meets a femboy who, for some reason, has also been suddenly entrusted to his uncle's care. He seems a little out of his league for his age, but he's a little friendly and curious about sex.
Under the same roof, he smells the ocean and the tanned femboy. The hot days are still continuing.

Drenched in sweat, they have sex in the countryside, then have some outdoor sex, and then have some steamy sex on the tatami mat with the femboy!!!

(Source: Dlsite, translated)