Lia

However, the last log in my mental dam finally broke one day when we were watching TV together. She stood up for a moment, and I watched her ass in grey leggings look so perfect that I couldn't peel my eyes away, before she lifted up her leg to blast a loud airy fart. She did her bratty little "evil fart laugh" as I'd call it, but instead of shrieking like a banshee and complaining, I just sorta stayed awkwardly silent. For the first time, I was totally turned on by her fart, and it made me react totally differently to how I normally would. It was so out of character that she said, "No reaction? Come on, that was a good one!". My heart was nervously beating, as I noticed I'd gotten a bit of a bulge, probably not enough to put it together, but you know how it is when you're hoping somebody doesn't notice something? That something suddenly seems super obvious. I had to play it off, but I now knew I wanted more, and an excuse to smell them in a sneaky way came to mind. "Nope, I'm not reacting to that anymore, it just eggs you on to fart even more." She did a slight raspberry with her tongue and said "Lame". I stuck my tongue out in response, and we went back to watching tv. I silently enjoyed the intoxicating stench. Like I said, my sister's farts STINK. They are meaty and give off an essence of thickness to them. If she farts next to you, you're going to feel engulfed in it. A bit later I once again smelled something rotten, she must have silent farted, but I just kept on like nothing happened. After another silent one, I could tell in my peripheral that she was taking this as a challenge. Honestly, I was surprised it worked out so well, I was getting to sniff her stinky silent farts, and I was having an even harder time keeping from pitching a proper tent. I took a moment to shift my member up toward the waistband of my sweats. Waistband trick never fails haha. Though I had to hope she didn't notice the actual shifting. But she wasn't going to be deterred, I had truly egged her on alright. She got up from the couch to get a drink, but she suddenly stopped in front of me, bent all the way forward, then blasted an even bigger fart than the one earlier, a real ripper that went for 3-4 seconds and tailed off cutely at the end. She was sure she'd get me, but I just sat there playing along with the no reaction plan... "Damn..." she said, "That one stinks too, not even gonna plug your nose?", I just tauntingly took in a deep sniff as to say "I win", but in reality I was sinking myself deeper into my fate. This was a pretty gnarly fart, and I was just sniffing it, she knew something was weird, she just needed to figure it out.

I was in horny brain and thought I could play the "tease your sibling" card, but this was a bit of a stretch. She retorted with, "You're only making it worse for yourself, Sal! She taunted back, "but don't worry, if you keep sniffing like that, you'll learn to love it" she laughed at me as she resumed her trip to the kitchen. She let off a few more farts after getting back, each to no reaction, before getting even more bold. She was determined to win whatever this dumb game I started was... She stood up on the couch we were on, side stepped over to my head right by my ear and blasted once again. It wasn't as big as the other 2 big ones, but right in your ear, it's pretty impactful. "SAL!!" she said, "WHAT IS WRONG WITH YOU". I had not pushed her away or anything, so she could hardly believe what was happening. Horny brain yet again refused to get me out of this mess. I could only come up with saying, "You are always farting around me for the reaction. You may be riled up now, but you'll eventually get bored and leave me alone." "It's not like I only fart to mess with you," she said, "I'm gonna fart no matter what, so it's weird that you're not reacting to it!" I just replied by saying "You're the weird one, all I did was stop reacting and you started farting on my face. Just give up, I'm not reacting to it anymore, no matter what you try."  There it was, my horny brain was deep in the horny pond, and it threw out a horny brain challenge. Honestly, I could hardly believe what was happening. I hid behind the veil of proving a point, but this was beyond what was normal. She was gonna start figuring it out soon, if not already. I was shaking inside with nerves thinking "what have I just done?". There was no telling what this would lead to, maybe my life would be ruined and I'd be shunned or cast away as a pervert, but I'd never experienced a fart fetish moment like this before, and horny brain REFUSED to cut it off. She was taking the initiative, I said to myself, as if that somehow absolved me from allowing this to happen.

"I didn't fart on your face!" Lia replied "Yes you did" I spoke back before she quickly added "Nuh uh, I farted on your head, there's a difference!". I told her "It's the same damn thing." To which she said, "Not even close! Guess I'm just gonna have to show you..." Still standing on the couch, she sprung into action. To be honest the word "sprung" may be a bit ambitious here, she did a bit of a "jump fake" toward me, expecting me to stop her. The brief little pause was like her saying "Seriously? You're seriously not gonna stop me as I stick my ass in your face to fart on it?". But the pause quickly passed as I unmovingly sat and watched her straddle my body facing away from me with her legs spread, before dropping her ass cheeks to nestle my nose between them. Her soft grey leggings left little to the imagination as I felt what it was like to have a girl's ass on my face for the first time. It was incredible! I tried to take a few small sniffs so as not to be too obvious, and her ass smelled really nice, however she'd showered a few hours earlier, so the scent wasn't as strong as her panties tended to be, but there was something magical about how my nose fit right into place, the warmth of her ass cheeks embracing it. I felt myself get even harder than I'd already been, probably harder than I'd ever been before (Once again, waistband trick for MVP). Then, as if she'd done this before, she wiggled back and forth a bit to help my nose find her asshole, and said "Oh my god" in a tone that encompassed the unbelievable situation she'd just found herself in, then continuing with "well, you asked for it". I could feel her asshole over my nose push, as a burst of hot smelly air permeated my nostrils and subsequently my lungs. I was committed to not reacting though, and as the airy fart blasted my senses, I was silently in heaven. I had never been face farted before, and finally, my dream had come true. I wanted more, and I didn't care that it was from my little sister. Her ass was to be adored, and she was suddenly like a goddess to me.

This fart was her longest one of the night, but a bit muffled from my face and my nose being pressed against her asshole as it emerged. "Mmm," she lightly muttered, before proudly exclaiming "Now THAT was a face fart!" with an evil laugh, and wiggled her butt around my face "I warned you! So how was it, did it stink?!" she added, really emphasizing the word stink in a teasing way before leaning forward and looking behind at me with incredulity as I sat there blank faced. It really did stink; a power packed punch of stench that wafted across my face, and since I was too afraid to try sniffing deeply, the stinky air lingered all around me. It stunk worse than any fart I'd smelled before, but I only answered, "I'm not reacting remember?!" "SERIOUSLY?!" she said in shock, before suddenly shifting her attitude to a dominant bratty one, "Fine, well since you don't mind, I think I like you down there." she proclaimed as she grabbed the remote and sat herself back down onto my face, resuming the show we'd been watching together. she proclaimed as she grabbed the remote and sat herself back down onto my face, resuming the show we'd been watching together. She farted 5 more times during the 30 minutes or so left in the show, always laughing like crazy and usually making a comment when she did so, like "Go on, sniff it up" or "I guess you really are learning to love them," or my favorite, "I'm gonna keep farting up your nose til you make me get off, weirdo!"

The whole time, I could sense how she was still waiting for me to come to my senses and shove her off