Hoshikuzu no Oyasumi Good Night Baby

Synopsis

Ren Hoshiai and Yuya Tenmando are childhood friends who are married. The two have an incredibly cute son, Makoto, and every day as a family is filled with sweet happiness, like a dream. However, this is a delicate balance built on the secret that Yuya holds—he's an alpha, not an omega, and the one who gave birth was actually Yuma, Yuya's twin. (Source: Libre, translated)