What background is good to Sisters?

The basis is done, so I'm gonna make some variations for them!
I’m planing to add blindfold and toys! If I have time tomorrow, I'll add ball gags too.

But having trouble with choosing a background!!
Drawing both takes a long time, and there would be to many variations files...

-

Ended!

※ Actually, I wanted to practice how to use the Polls too = v=;;