Kiss wa Yukidoke no Ato ni Shite

From cmoa
On Christmas night, overcome by loneliness, Reo calls an escort service and spends a sweet night with Yuki, a "one-night-only boyfriend" who excels at incredibly tender, affectionate lovemaking. Gentle whispers, melting caresses, and sex that feels just like being with a lover fill the empty void inside him with warmth... Then comes spring and the new semester. There, right in front of him in the classroom, is Yuki, the very same man from that night. To think that he, a teacher, was held and pleasured by a student... Since then, Yuki has been pressuring him into an exclusive arrangement, with the condition that they keep each other's secrets... [Younger "self-proclaimed boyfriend" x Clumsy teacher with emotional scars] A forbidden, sweet sexual relationship begins.

Original Manga: Beltoon, Booklive, Cmoa, DMM, ebookjapan, Mechacomic, Piccoma, Renta!, Zebrack