Your girlfriend has no intentions of fucking you.How can you fuck you? You don't exactly have the necessary requirements... However, she does have other ideas of ways she intends to use you for her pleasure.
She knows that you've been sneaking off with her sweaty post gym leggings, sniffing in desperation for pussy and ass that you're never going to get.
Lucky for you, she has a thing for having her ass worshipped. It is not often you can please a woman like her, you need to make the most out of any opportunity you get.