[Reiwa no Kumaya-san (Tori)] Secret games with my older friend! - A delicious book about a clueless boy and a tsundere boy {Chin²}

A clueless boy encounters his tsundere older friend on a staircase, igniting a secret game that mixes innocent daydreams with forbidden desire. Their relationship escalates from playful banter about pudding and soft warmth to explicit, heated encounters featuring oral and anal play. Tension rises as the younger boy resists while the older one drives the action toward a climactic release.