Curious Little Step-Sis

When small Lulu Chu stays back home with her enormous stepbrother Michael Swayze, she wears a casual piece of clothing and makes a plan to secretly observe him. Michael creates an arousing dialogue with his girlfriend when he notices Lulu listening in concealed. Initially angered, he finds out Lulu is wildly inquisitive and keen to gather knowledge about topics he's discussing.

After she vows to keep it quiet from their folks, he educates her about all the things she desires to understand.