(Parei no cap 61 à espera de mais) the prota promised when he was little to marry Coto a god beast descendent, even not knowing all the situation, he ended having his baby, that beast told him not to go into the mountains where he came from because he would attract others with his scent, but because of an accident he ended up there and got the scent of the his partners brother so because of gealous he is turning into a real beast and that gentle brother is just lying and using the prota because of a revenge against their mother that left him to stay with another one and have a second child (he tried to brain-wash the prota to make him forget Coto)
Making a Child with a Beast