Kamatte Hoshii Shiba-sensei

Shiba Tsukasa is a manga artist who has been dating his childhood friend and senior editor, Kazuto, for six months. Having only experienced immature romance in the past, Tsukasa enjoys how Kazuto showers him with kisses and affection every day. However, for some reason, Kazuto refuses to take things all the way. Tsukasa longs to catch up to an adult romance, but Kazuto keeps treating him like a child… One day, Tsukasa accidentally meets Kazuto’s ex, a man with a mature aura. Doubt creeps in—Am I not enough for him…? (Source: Hobunsha, translated) Note: Includes two extra chapters.