Kaihatsu Douga - Naohara to Ore, Himitsu no Kankei

Fumito Naohara is a guy with a strange hobby; he uploads naughty videos of himself onto a sketchy website. Then, one day, a commenter suggests he tries teasing his hole, too. However, with his lack of knowledge, no matter how much he practices, Fumito can't seem to make it feel good. That's when his childhood friend, Kazuharu Isuzu, suddenly confronts him about his videos. Fumito expects their friendship to end, but unexpectedly, Kazuharu makes an intriguing proposal... Fumito decides to trust in Kazuharu's experience and agrees to his offer without much thought. However... Two childhood friends embark on an adventure to find out how to climax dry. What might await them at the end of the road? (Source: Renta!)