Manaita no Koi

A man named "Saki" who cannot speak comes to Okami Kei (20), who works at a market in the port, completely naked, wanting to repay a favor. Kei has no memory of helping Saki, but he is always trying to repay him, so when Kei spills that he wants a boyfriend, Saki replies in clumsy writing that he will become his lover. But the moment Kei brushes off the innocent-looking Saki, saying that he can't kiss a man, Saki puts his hot tongue into Kei's mouth!? A return of a favor that is too intense for a newbie in love... Why is Saki giving himself so much...?