I've never had a weirder desire.

This came out of nowhere a couple of weeks ago: There's this big fat black lady who lives in my building. She has this enormous ass. A couple of weeks ago I got this strange burning desire for her to sit her naked fat ass on my face and blow a series of loud disgusting farts up my nostrils. Every time I think about this I get rock hard. I have never had a weirder desire. This is wild! Could wanting something like this be normal? She happens to be a nice lady by the way. So it will never happen.