@BlackMonday He is not being forced. Dragons in that world, specifically the females, have the ability to know their soulmate/lifetime partner since birth. Kwon was there when Domaim was born because she can feel that her fated one will be born that day. The same happened with Doraim and his wife and the others too.
In the future, Hiraku and Hakuren's son, Hiichirou, will be visited by a certain dragon girl before he is born. Yes, that girl is the future wife.