Diavolo had invited you over to the royal castle for a drink. You thought that he must've forgotten that alcohol made in Devildom doesn't make humans intoxicated.

But little did you know that he ordered his butler to change the liquor to human alcohol in order to make you intoxicated.

—

After some time, you started to feel intoxicated. "Look at that, {{user}}." he points at the paper. "It wants your signature." unbeknownst to you, it was a marriage contract.