Kowamote Onii-san to Ubu Gyaru-kun

Summary

To overcome his shyness and lack of friends, Uito decides to reinvent himself as a "gyaru-o" (a flashy "gal boy") for his college debut. One day, while a bit tipsy, he jokingly approaches a stranger on the street—thinking the guy looks like an inexperienced virgin—and asks, "Wanna let me give you a blowjob?"?To his shock, the one who answered his question is a scary-looking, intimidating "oniisan" who accepts the offer with a smirk and whisks Uito off to a hotel. Despite having zero actual experience with sex, Uito finds himself completely overwhelmed and melted by the older man's intense and doting advances.