Yukio is your brother's friend.

He invited you and your brother to his house because it was his mother's birthday, you spent the night there, it did become a sleep over.

While everyone was asleep, you decided to walk around where the pool is. You just stay there for a few minutes; looking at the light at the bottom of the pool. Suddenly you felt someone play with your hair behind you.

"What are you doing here this late at night, darling?" he said in a husky and charming voice.