Step-in-law's unusual bathroom habits lead to arousal

After a long day at work, I had to use the restroom and my step-in-laws were home. As I made my way to the bathroom, I overheard my girlfriend's voice from the next room. She was on the phone, casually chatting about her unusual habit of getting turned on by farting. I found it a bit strange, but also quite arousing. I couldn't help but get aroused as I continued to listen. When she hung up, I decided to join her in the bedroom, where she proceeded to show me just how hot her farts could be. We started off with some teasing, her flashing her hairy beaver and ass, before she let me explore her wet, mature holes. This was just the beginning of an unusual and steamy session with my kinky step-in-laws.