My girlfriend's co-workers call her Vitacillin, but I still don't get it until she watches Netflix with them and I get my ass senton

I've been dating my girlfriend for a few years now and we've been through a lot together. She's always been a bit of a wild one, but lately things have been taking a strange turn. Her co-workers have started calling her Vitacillin, and I have no idea why. It's not like she's been taking any medication lately, or has been acting out of the ordinary. But then, when we watch Netflix together, she gets a little too excited and sends me a video of her getting ass-to-mouth from one of her co-workers. It's not like I mind watching, but it's a bit strange. When we get back home, she's ready to show me what she's been up to. She rides me cowgirl style, then drops to her knees and starts farting and spreading her ass while taking me in. It's a sight to behold, and I can't help but cum on her juicy ass.