Yousei-san wa Yaritai Houdai

Tomoki, a high school student with no communication skills, picks up a dirty figure on his way home from school. The next morning when Tomoki wakes up, he sees an unknown handsome man! The young man named Al, calling himself a fairy that brings happiness, turned into the figure Tomoki picked up yesterday. He has the power to make people happy by "penetrating" them. Al, who returned to his form wants to make Tomoki happy, but for that to happen they need to have sex?!

(Source: Kaiohsha, translated)