Help finding a story

Hello! I hope this isn’t against the rules but I’m stumped on where this story went.

I belive it to be on deviant art and have the title that’s something along the lines of “the things we do for family/our siblings”

It’s a story on how the mc is asked by their big bodied sister if he can be her fart filter while she dual streams games and only fans, he’s only asked after their mom couldn’t take being the sisters filter any longer and the MC ends the story with the implication that he now sleeps with his face in his sisters ass.

Again sorry if this is against the rules but I just can’t find this story. Any leads would be appreciated