I have a female friend who turns me on whenever she has to got to the toilet
One day she forgot to flush as I went in after her and she had left a smelly turd in the bowl that aroused me

I picked it out of the bowl, placed it in a plastic bag and threw it out of the window
On my way home I retrieved the bag with her shit in it

I put her waste into a jar which I sealed
Whenever I masturbated over her (over pics and videos of her), I would take a whiff of her shit and it would make me cum immediately