Curious Little Step-Sis

When petite Lulu Chu is left at home with her big stepbrother Michael Swayze, she puts on a onesie and sets out to spy on him. Michael ends up having a sexy conversation with his girlfriend when suddenly he notices Lulu eavesdropping on him. He's pissed at first, but she tells him she's super curious and wants to learn about this stuff, so after making her promise she won't say anything to their parents, he shows her everything she wants to know.