It was a rather uneventful day up to that point. You were watching family guy with Holly in the front room at 11PM. You were both drinking alcohol, Cider, to be precise and eating snack food such as chocolate and crisps.
You and Holly got along well enough, she could be a bit pig headed at times but you never thought any of your siblings were perfect and, honestly, she was better than Jodie and Rebecca.
Throughout the program, you noticed Holly's stomach growling every now and then, as if she was hungry. This isn't something you would normally pay attention however you had a thing for farts since you were about 12 or 13. You couldn't quite remember and you don't even know what brought it on.
This happened for around 10 minutes, when Family Guy finally went to commercials, "hey, Dan" Holly said.
You instinctively looked at her. As you turned around, you saw her looking you in the eyes with a grin on her face. She lifted one leg up slightly and...
*PPHHHRRRIIT*
Forced out a 3 second loud, basey and wet towards the end, fart. It stunk of beef and rotten eggs, in fact, the smell immediately dominated the room. She gagged at her own creation: "wow! I can't believe I just did that, I seem more bothered by it than you! I need to get out of here. Be right back", and before you could even fake a gag reflex, she was up and out the room. Heading into the kitchen.
You were left in the room with her beefy creation and you immediately felt yourself go hard. Rock solid. You took a deep breath in through your nose, breathing in the toxic fumes and you noticed a leakage from your pants. Again, you sniffed the air around you and then you looked down at the sofa cushion Holly sat on. You could see the imprint of her ass cheeks buried into it.
"Do I?" You thought to yourself... you don't know when Holly will be back but you were in total ecstasy right now and was feeling daring. You needed this. "Yes.." you thought to yourself. Leaning over to her couch cushion, you put your head over it and took a deep sniff of where the smell was strongest. It burned your nostrils. It was the same beefy rotten egg smell amplified. You sniffed again and then...
"What are you doing?"
You shot up, red with embarrassment and turned to face Holly who stood over you. As confused as she was amused. "It's not what it looks like! I thought I saw a spider!"
"Right. And you need to press your head into the pillow to see it?"
"You know I don't have the best eye sight, Holly."
"Yeah. You struggle to see things up close. Short term eye sight. Don't treat me like an idiot! Were you sniffing for the spider too? Because I heard that!"
You were lost for words. Going even more red with embarrassment, you just wished the couch would swallow you hole.
"Oh. My. God. Are you hard right now?!"
You looked down and noticed your hard crotch was on full display. You hated to admit it but the embarrassing situation you were in right now made you rather horny. It was just like the start of one of your pornos.
"Jesus! Getting hard over your sisters farts?! Sniffing them when you're alone? Are you some kind of pervert, Dan?"
"Holly, please don't tell anyone! I'll do anything! Please!" You had practically fallen to your knees begging. Holly's disgust and bewilderment turned to amusement. She sat down in her original seat and you remained on the floor looking up at her. She had an evil grin. As if she had some twisted idea.
"Anything, Dan?"
"Anything!" You replied, dreading what she was about to say or do.
"Sniff the couch seat again" Holly said, laughing at you.
This was awkward now. You looked at her pleadingly, she wa sat where she wanted you to sniff. Sure, your fantasies usually started like this but this was your sister! And you weren't sure you were ready for this!
"I guess I could always tell Jack... you know what his gas is like. I'm sure he'll love someone t" - you dug your nose deep into the cushion seat and took a deep sniff. The smell of the fart lingered hut had dissipated in its smell. The worst part was that your nose was less than an inch away from her crotch area.
She burst out laughing. You looked up at her with a pleading face and she immediately stopped and took to a serious tone with you. "Did I say you could stop?! Get your nose back in there!"
You plunged your nose back into the crevice and sniffed over and over again. Then you heard something quiet. And the room stunk of shit. "Oh my god, that stinks! Sniff it up, Daniel! Go on, that's a good boy!"
You were so hard at this humiliation and stench that your cock began to strain and hurt. You sniffed her gas up eagerly, putting aside your reservations about how humiliating and wrong this was to just enjoy what you have always wanted to enjoy. You kept sniffing for 5 minutes until she pushed you away and stood up. She pulled down her jeans and gestured for you to lie down on the floor. You obeyed without hesitation, she then squatted over your face. "So bro... you know how our parents are going to be away next week?"
"You're gonna be my slave. And you'll be doing a lot more than sniffing farts" she stated.
"But" - *PPPPPPPHHHHHRRRRRRRTT* you were going to object but you were cut off by the raunchiest fart you had ever heard. This one stunk of shit too and you immediately and without instruction began sniffing.
"Ahhh... I think I'm going to enjoy this. So what was that, bro? You'll be my slave and get all the gas you ever dreamed of?"
"Yes..." you whimpered from under her cheeks, ashamed of yourself.
"Good..." she said. She remained squatted over your face for another 3 minutes then got up and went to bed. You did the same. The two of you never really discussed what happened that night until last night, when she reminded you of your agreement and told you to be in her rook for 9AM sharp.