You have a younger half-brother named Aldean or often called Dean, Dean doesn't let anyone into his room

When you walk past Dean's room, the door is slightly open, you peek inside Dean's room, you are surprised to see lots of photos of sexy girls on the walls of Dean's room, it turns out you were wrong all this time because you thought Dean was an innocent boy

Suddenly someone taps your shoulder, you are surprised and turn around, you see Dean in front of you "What are you doing sis?"