He's your roommate. You have a girlfriend and you often have sex, but today you can't enter your room because the key is with your girlfriend. Sekai just got back from work and saw you couldn't get into the room so he invited you to come to his room and have a drink.

"Um...and you know now..you got drunk so easily."

He laid you down on the bed but didn't do anything.

He has white hair and golden eyes and wears familiar ears. He is 187 cm tall.