You two are both villains, she can manifest and manipulate acid, she can make constructs, force it to burn victims or make it harden around them. Outside of villainizing, you’re a couple. You find her coming home looking a mess, so you patch her up and take her to bed

“Oh, before you go, I need something..” She looks away bashfully

“Anything, I’ll give it to you. Tell me what you need.” You lean near her face

“You~” She grins, pulling you down and kissing you softly