You stop your back and forth motion and sit down heavily on the back of Lewis' head, adjusting your feet a bit to make sure the sole of your foot is completely covering his mouth, so that he can only breathe in through his nose.
"Mhhh!, Rrrh!" shouts Lewis into your feet. You laugh and reply "Feet AND farts, bro! Looks like your gonna get to kiss your big bro's feet and sniff his farts at the same time!" You then bear down letting out a 3 second high pitch fart on the back of his head that stinks pretty bad. After a minute or two you can feel some serious gas stirring up but first you sit up a bit and reach over to the nearby couch to grab a throw blanket. Lewis has lifted his head and face off your feet a bit gasping and coughing.
"Ash, no more, please, I beg you!" Lewis cries out. "Dude, I've got a storm brewing in here and I'm not about to waste it!" you reply. You sit back down on his head, pushing his face back into your feet, and wiggle them a bit until his mouth his securely covered again. "In fact, I wanna make sure not one bit of it goes to waste" you say laughing as you wrap the blanket around your backside and over your brother's head. "Gotta seal in the goodness!"
Lewis' struggles hard, more than he had in the last 20 minutes but you hold him, nice and secure. You spread your big and middle toes again allowing his nose to slip inbetween it. "Ahahahaha!" You start cracking up. "Whaddaya know.. Your nose goes in your bro's toes!" you taunt while wiggling them before releasing a loud ass blast on the back of his head. *BRRMPPPPPP* You let out a loud bassy fart followed by a succession of 5 smaller ones. "How are those? Ughh nevermind that answers that, hahaahah" you laugh as you sniff the air and smell the rancid gas you've just released. Your little brother's lips are pushed firmly against your sweaty bare soles forcing him to breathe through his nose, smelling both the fart and inbetween your toes, with the blanket locking the smell in further - it was ultimate domination; you could just feel the intense humiliation he felt and you loved every minute of it. After about 10 minutes you're ready to switch to some face farts.
"Ok, bro, I think you're done marinating." you move the blanket aside and most of the smell has dissipated. His face has been pressed down firmly in the same spot of your sweaty bare feet for the last 10 minutes so to emphasize the humiliation you make sure to lift his face off very, very slowly. "Ahahah, see that bud, they like you so much they don't wanna let go" you're hysterical as the effect is as you intended. By lifting his face slowly after being pressed in for so long the bare soles of your feet are slowly peeling off his cheeks, pulling them up as they've stuck to them from all the time, pressure and sweat.
Feeling another fart coming on you quickly flip Lewis over on his back and quickly lower your ass down onto his face. He turns his head to the side and you are now sitting on his cheek. "Nah uh" you taunt. You grab your brother's face with your two feet and use them to position and hold his face straight upward. As you sit down they move out a bit to the side but your ass and thighs are now securing his head in place. You shift just a bit so your bro's nose slips up your crack. You know that with only the thin mesh of your shorts he can feel the full effect.
You let out a sharp, quick sonic boom of a fart. "How'd that feel, bro?" Lewis was just about broken at this point... he was mostly just shouting into your ass, not really struggling. "That stink... whew.. .. ok but I want to hear you sniff that fart." As he tries to respond you lift your ass up just enough so you can hear him.
"I.. won't...I don't care what you do anymore, you can't make--, Gahhh!" - you interrupt your brother's defiance by prodding at his ribs and tickling him mercilessly. You pause for a moment to reach over and grab both of your tube socks that are on the floor by your shirt and reaching behind you stuff one in his mouth and tie the other around his head. As you reach back to his ribs and start tickling Lewis screams into his new gag - your sweaty socks - but once you stop the only thing you can hear is the sound of Lewis breathing heavily, in and out, through his nose.
"What's that sound, bro..." you turn around looking over your shoulder grinning at his tormented face. "I'll tell ya... that's the sound of me making you sniff my farts... and you're not just gonna sniff 'em, bro... I'm gonna make you inhale 'em," You laugh as his eyes widen. "I'm literally gonna fill you up with my gas. You're gonna suck 'em out of my ass just like you snorted my pits"
Lewis starts his muffled screams and flailing his legs again. You once again grab his head with your feet, forcing it upwards, wiggling your toes dominantly and then slide down, seated onto his face, now holding his head still with your thighs. You've been holding it in but you want to make sure to unleash the rest of your gas directly into your little brother's lungs. You shift and adjust again so that his nostrils are right in your crack, and you once again start tickling his ribs. Once you seem to feel his nose pulling in air at the mesh of your shorts you unleash.
The first was an 6 second trumpet fart that was RIPE. You continued tickling Lewis. "I can't make you, you say? What am I doing right now, lil bro? Hahah, I know it's probably hard for you to concentrate on anything but that awesome smell but if you can just think about it" your tone becomes even more arrogant hoping to completely diminish him "think about what's actually happenin'... I'm in control." you shout a bit. "I'm controlling you right now, making you inhale my farts... just gotta push these buttons, hahah" you dig in tickling him a little harder.
The farts never stopped for any longer than 20 seconds and carried on throughout the next 10 minutes...short squeekers, wet sloppy farts, and more bassy long blasts than anything else; they were all RANK and Lewis huffed up and puffed all these butt blasts right up his nose. Throughout this you reached back, rubbing and the top of his head. "That's it, lil buddy, take in all your big bro's stench." you said, warmly with a chuckle. "Remember it. Remember it so well that if I so much as walk into a room you know to be submissive."
Shortly after you ran out of gas you notice that tickling Lewis was no longer making him thrash about. You jumped up and spun around, lowering your ear to his face with some concern. You hear his breath and realize he is sleeping. You literally put him to sleep with your farts. You had forced your lil bro to endure your smells in the past, many times but never like this. Today was about breaking him down, exerting total dominance over him to the point where he would never again think to bug, annoy, disobey or do anything but submit to his big bro.
You weren't completely sure, but pretty confident you had accomplished this. You bend down and scoop Lewis up, looking at him still asleep as you cradle him and shake your head, laughing. You decide where to put him...