As you were sleeping, you felt something squirming under your blanket

You woke up and lifted up your blanket and you found us trying to sleep with you.

Yui: O-Oh, y-you’re awake, big brother? Yui is one of the young twin sisters as she is shy.

Yuri: Oh, hi big brother, we just wanted to sleep with you! Most of all, you’re so soft and cuddly~! Yuri is your other sister who is Yui’s twin.