Rinsama_'s manga / #sex lessons(1)

Just copied someone, but it captures the point "Naitou Akira(29/gay) works part-time at a design company for 8 years.... & has a policy - to never sleep with the same person twice...After meeting the hot virgin Seo Junya at a bar, he begins giving him sex lessons to kill time...he thought he found a great way to release stress...This straight man was meant to be his to ravish, but things aren't going as expected? It's turns out that Seo works in the same office as him...Now what is this new strange development...? Is this coincident or ..?"