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After a sweaty gym session you all head back to Alex's place. Your girlfriend decides to take a shower and that's when Alex lets loose. She immediately starts ripping rancid farts while talking about how the protein shake always does this to her. She bends over in her tight moist leggings and lets them bubble out one after another. You're shocked, but can't help get hard. She notices and tells you that your girlfriend may have let her in on your naughty fetish. She knows her best friend won't give you what you need so she wants to show off how gassy she is for you. She encourages you to stroke to her big stinky ass and eventually pulls down her leggings exposing her raw sweaty pink asshole, inviting you to sniff and lick it. You can't resist. You are both having such a nasty kinky time that you end up fucking while she farts all over your dick and continues talking about your fetish until you both cum hard.