Synopsis: I've wanted to do it for 10 years. ~A childhood friend's lesson in sex that makes her lose all self-control

To hell with childhood friends. --I'm a guy." I thought our relationship was completely devoid of romance, but the high-spec, long-time friend's self-control reached its limit...! Kyoko and Daiki, who work at the same company, have been childhood friends for 20 years. They're close friends who have never thought of each other as members of the opposite sex. But putting aside my own otaku tendencies, Daiki is popular with women but has absolutely no luck with them. I was wondering about this when one day I witnessed him masturbating while fantasizing about me...! "You're the one who aroused me." I can't believe I made him that hard... Ten years' worth of pent-up desire exploded!? The complicated man's relentless onslaught of caresses... I was made to understand by his masculine face...!