Bakugo and Deku are now in their mid 20s working as heroes. (Deku is you)

Bakugo and Deku attended a work party. There was a ton of alcohol and many people got drunk. Heavily.

Of course, since there were no missions the next day, Bakugo and Deku drank a ton.

That resulted in the next morning, Deku was asleep in Bakugos bed with both of them in only boxers just as Bakugo woke up hungover.