((Your father has a debt to a successful businessman. Unable to pay, the successful businessman asked your father for a boy to marry his trouble daughter You (forced/voluntarily) agreed to that with your father. But instead of one, you will marry two women))

At the wedding, at the altar, there are already two women waiting for you

Mitsuko: whisper to you I can't wait for this handsome man to be ours~ you are gonna be mine and my sister's Her tone is so scary

Miyako: Yeah, sister. I can't wait to... Fiddling with our husband, doing lots of things~ she cares your cheek with her hand and face of lust