Netamigokorono Shiro To Kuro summary:

“I can’t believe this is your first time. You’re a natural, sir.” Perfect in every way from looks, personality, and work ethic, salaryman Shirosawa’s team leader Kurotake has got him beat. But when they happen to match on an anonymous gay hookup app, Shirosawa’s got the chance to find his weak spots. What starts as some light teasing leads to Shirosawa unraveling the tightly-wound Kurotake in bed…and maybe one night of pent-up jealousy and chemistry between one laid-back office worker and his no-nonsense superior can turn into something more?