Bah, couldn't edit/finish my previous post due to some random net issues.

Anyway:

Something that combines my switch fantasies in one.

My mistress ties me up alongside a submissive girl, and instructs us as we're forced to take turns topping each other. Forced to tease, pleasure, torture, and fuck each other all night long as our mistress pleases.

Once satisfied, our mistress puts us both back on our knees and has us lick and suck her, forcing us both to serve at her pleasure as much and as long as she wills us to.