I’m gonna be honest OP, this is kind of a skill issue. If your yuri ships are boring you, you’re simply not trying hard enough. Fan fiction/art is about taking canon as a springboard and running wild with it. If your yuri isn’t toxic enough, no matter the fandom, then it’s kind of on you for letting canon limit you. There’s toxic yuri fanfic of my little pony characters, idk what to tell you. Have some genshin toxic yuri thoughts of my own, about Arlecchino too since that’s who you mentioned (tho ofc I have other ships).

Not toxic in the traditional (towards eachother) but Arlynette is definitely a toxic dynamic and not just because it’s parent/child or caretaker/dependent or even just a power dynamic. They’ve got so much corruption potential it’s insane.
Arlecchino’s already killed two men with her own hand by the time she takes in Lynette, barely around 10 years old and probably not even old enough to understand the seriousness of that.

Someone had to see her potential and teach her, take her pleasant and quiet nature and her intelligence and hone them into a weapon. Someone had to teach her where to cut, where to stab, so it’s quick and easy, and more importantly clean so that not even a drop dirties her pretty little hands (picture Arlecchino’s long black and thin bony fingers holding lynette’s smaller rounder and clearly younger fingers in her hands. Lynette’s pale skin in contrast to the black cursed skin of Arlecchino’s palm).

And just the same someone had to teach her where to lick, suck, nibble. Place cursed hands on her pale hips and guide her, teaching her how to rub herself against her Father’s thigh as a way to reward them both for a mission well executed. Teaching her more and more things until she learns also that such a quiet girl as herself is welcomed to scream and moan and gasp her throat raw, all thanks to the safety provided by those bloodstained hands gripping her hips and the comfort of her Father inside of her. She's for once safe enough to raise her voice.