Itte Owarina Wakeganai!

Overview

Riku and his friend Takuma have had a crush on the same girl since they were children and have competed for her all along. For this reason, Riku has always considered Takuma his rival. They were usually playing rock-paper-scissors, but at some point, their betting games have become kissing and hand-job competitions! Takuma's experienced, and his dick is huge... Nevertheless, Riku's determined to make him cum first and win the competition. However, while Takuma's giving him a hand job, he kisses him fervently, blowing Riku's mind away...! The competition is between a pushy popular guy and a virgin who hates losing, but neither of them is willing to give up! (Source: Renta!) Note: Includes two extra chapters.

Source: AniList