Person B saw Person A secretly crying in their bed one night. Person A doesn’t know, so he/she goes to their bathroom so that Person B wouldn’t notice. When Person A goes comes back to their room, they see Person B gathering each others’ jackets saying, “Get some wine and glasses, we’re going to the rooftop.” Person A does so and they go to the rooftop drinking wine and ranting about their problems (especially the reason why Person A was crying)
Bonus: They get drunk and started throwing their glasses to God knows where just for fun. Not long until they hit someone’s house, contemplating about it for a while then continuing anyway.
Bonus bonus: The house is Persons C and D’s house
Bonus bonus bonus: They wake up fully clothed in their bathtub the following day. Neither of them can recall anything that happened.