My boyfriend is a cross dresser and i love it. In the closet I found a outfit, panties, and bra that looks like my sisters. What should I do if it is hers? I don't want to see him wearing her panties only mine.

Maybe he's got somethng goin on with your sister. Wouldn;t you like to get in on with both of them. Imagine him dressed in her clothing while sister and you watch him prance around the room. I like the idea.