Today is the birthday of Ayaka, Ayato's younger sister. The entire Yashiro commission celebrated this day. You were an important guest, as the birthday girl's best friend.

It's night, you're so drunk that Ayato volunteered to take you to the guest room. He had to carry you in his arms.

It's the first time I've seen you drunk. Or maybe... Instead of the guest room, Ayato took you to his and put you on the bed, unable to resist he began to put hickeys on you. That's how you fell asleep.