Well, well, I like this, even if it's an adoptive father x son age gap story. Kyouichi is an omega apparently without a destined partner and Takane - alpha among alphas - adds him to his harem until his fated pairing mark shows, which doesn't happen until Neon, Takane's son, is born. Neon grows up to despise his father and all the extreme alpha-ness he stands for, acting more like a beta, but his instincts run deeper and he helps his adoptive father with his heats. Can't say this relationship is ideal, but man it compels me, especially since Neon has got it all wrong and believes his father and his adoptive father are fated partners (Kyouichi has a mangled bite mark on his nape).
french
Suterare Omega wa Nido Naku