Admin Mawile: ( ゚▽゚)/ The reason behind it is totally up to the reader!!
Shuu: His father has been nothing but cruel and distant to his mother, and he doesn’t want someone like that anywhere near you.
Reiji: While he does respect his father, the very idea of the man getting close you sends a surge of possessiveness through him.
Ayato: You’re his and no one else’s, and his shitty father shouldn’t be anywhere near someone as sweet and good as you are.
Kanato: It makes him cry to think of anyone taking you away from him, especially a man who’s done nothing but be cruel.
Laito: He detests the idea of that man going anywhere near you, and honestly, it makes him rather sick to even think about it.
Subaru: He would kill the old man himself before letting him near you. You never deserve that person so much as touching you.
Ruki: He’s a bit excited by the prospect of having you be his real mom, but he can’t help but feel a bit jealous of your attention going to anyone else.
Kou: The idea of the man who saved him marrying you someday makes him so excited he can hardly take it. It’s a wonderful idea!
Yuuma: He doesn’t particularly want anyone to take you away, but that man is definitely the best possible candidate.
Azusa: If you want it, he’ll approve of anything. All he cares about is you being happy, not who you choose to be with.