Question and ideas? Girlfriend wants to help explore my sub side.

Hey guys. I am currently in a great relationship and my gf knows about my sexual fanatsies and fetishes. Just seeing what i should have her do to me or how to start out. She has already play with fingers in my ass but knows i am into being sissified and caged too, for female domination purposes only.

She does have lingerie and we do have toys. I also have a cage.

Any one have any ideas of what I should tell her to do to me/with me. We both are very open sexually im just having a hard time trying to explain what she should try out first with me.

Just want to see what yall think!

Thanks

Addition to what i posted. Her and I are both switches. We just never really experienced the opposite side of things. Im usually dom and shes usually sub.