Usotsuki na Tsugai

Akari, an Omega whose heat period wouldn't come – even after becoming an adult – is despised by his family and called "useless". However, one day, an Alpha appeared who wanted to be paired to someone like him. This man, Shinji, who forced Akari into a heat-like state with medicine, wants to fill up his desires inside many times. "No... something's... coming...!" Akari's body , which should have been immature, is awakened indecently by Shinji.