I just come home from the gym where my boyfriend is waiting for me (roleplay). 
I tell that I feel so sweaty and dirty and that I have a special task for him. I thought about it during the gym session, that it would be amazing if he would clean my asshole with his tongue. 
After some dirty talking I give to him many instructions of how I want my asshole to be cleaned. I make some farts too, but the focus is on ass licking. At the end I thank to him and say that he is now my personal ass cleaner.