Hajimete no Sefure

Overview

My first fuck buddy was the first person I ever fell for. Despite having zero romantic experience, Sano Kiyotaka and Aihara Tamaki accidentally met as fuck buddies on the first dating app they ever used. They fell for each other, but were convinced they'd be dumped if they didn't maintain a detached, adult attitude. Even as their bodies grew closer, they struggled to bridge the emotional distance. A lewd yet pure, innocent yet erotic one-sided love comedy of two people who met and fucked on their first date begins! (Source: Shogakukan, translated)

Source: AniList