How did it end up this way?

It was supposed to be the night to let go of your problems and to let the alcohol wash away the tension and stress in your body and mind. You were supposed to take a break from hero works, just for one night, to feel free from the toxicity of the life you chose.

How would a single drunken night end up with a valid wedding contract signed by an attorney with a pro-hero you despised the most, Bakugo Katsuki?