Tartaglia is a tall man, but squeezed between the Warden of Meropide and the Chief Justice like this he feels small. He has to raise his chin to stare at Wriothesley's face, both his hands placed on the Warden's hairy chest as leverage from the attention Neuvillette has been giving to his nape. A graze of his teeth, followed by an apologetic lick. Tartaglia can feel the dragon's need to claim by the hard grip on his hips. Neuvillette's palms were large, nearly encapsulating the girth of his waist. If he ever is allowed to leave this room in the morning after, he's sure the marks will be there.
Wriothesley leans down to kiss him and Tartaglia really has no choice but to follow the older man's lead. Sex has always been an exchange to him. He's not used to kissing, or any of the foreplay and worship these two are giving to his body.
His clit throbs. Need claws inside him. He wants to be filled. He voices that with a whine.
Wriothesley chuckles against his lips. "Impatient little boy. Neuvillette, on my command."
Tartaglia is suddenly hoisted up by the backs of his thighs. He's spread open and immobilized. When Wriothesley takes a step forward, his hard cock in hand, Tartaglia can do nothing but watch as the older man guides its tip to his entrance and then slowly pushes himself in. Stretching Tartaglia's insides, the heat pulsing, making him shake. Tartaglia bites his lip, his hands reaching forward to clasp around the burly muscle of the Warden's biceps.
"Atta boy," Wriothesley whispers, canting his hips slightly so he can shove in the last of it. Tartaglia releases his breath shakingly once the older man's bottomed out. "Try relaxing a bit. You're squeezing me so tight you might just chop my dick off."
Tartaglia tries to regulate his breaths, but his concentration breaks when Neuvillette rests his chin over his shoulder to also look down at the place where Wriothesley's cock disappeared inside him.
"How does he feel?"
"Fucking divine."
"You believe he can take us both?"
"Hm, maybe. I'll loosen him up first then you can be the judge of that."
Neuvillette's voice drops, "I'm looking forward to it."

THE CROWD IS CHEERING!!
Neuvilette is an elemental being; just a simple touch leaves Tartaglia squirming around, holding onto Neuvilette's wrist for dear life, as if he's on the verge of orgasm, so when he's being restricted by tentacles, the hydro all around him and restricting him completely, his brain getd fried by the inmeadurable pleasure. His constitution is impressive, any other human would've lost their mind sooner, but all that did was only make things even better for Neuvilette.
It must also hurt Tartaglia's ego, to be reduced to a mess by the same man who humiliated him in front of his friend, the whole of Fontaine and its Archon 🥴 he tries soo hard to not give in but it's not long until he's just gasping out "So good"s and "Too much"s and "No more"s inbetween fractured moans

I'm in the same boat as you! Although I don't think this is an explanation as to why I'm fixed bottom!taru I would still like to share my experience: back when I first started interating with Genshin content, bottom tartaglia was rare if not nonexistent. people would even joke about how he "didn't have an asshole" and that rubbed me the wrong way lmao
Maybe that was the trigger. I just pictured Tartaglia taking fat dick up his ass and that awakened something inside me. Whatever the case, I just LOVE seeing him stuffed. pillow princess Tartaglia? Hell yeah! bratty bottom Tartaglia? hell yeah! power bottom Tartaglia? HELL YEAH!
He's a prideful warrior who's always up for any challenge! No matter who (or what) it is, he will take them!