Go after her?
From Create Your Own Story
You decide to follow her to her room, you didn't get enough satisfaction from the little pervert. As you enter the room, you can see her tucked in her bed, pretending to sleep, probably thinking that you are mom or dad.
You close the door carefully and approach her bed with a wide grin and a large erection. "Little sis, you should take responsibility for what you wake up!" you say as she turns towards you, staring at your erection.