Nuzzle.
She guides Eliese through increasingly complex arcane concepts over the next two months leading up to Eliese's own birthday.
And -
She thinks, in her down time, whenever she's hanging out on her own or separately from Eliese. Pauses in the middle of reading to stare into space. Turns over the emotions Eliese kindles in her chest, Eliese's love confession, the terrifying idea of loving someone -
Eliese wouldn't demand anything change. She's good like that, wonderful, doesn't expect Acererak to be anything other than who she is -
But it'd change something in Acererak's head all the same, she thinks, if she loved Eliese. (She's not sure. She meant it, about never having loved anyone before. How should she even know what love feels like?)
Acererak spends a lot of her time on planning Eliese's birthday present, too - more than she needs to. Eliese is unlikely to be upset if Acererak gifts her an unwilling alt... And caring about other people's preferences and consents and - social stuff - is hard - and Eliese might like a masochist her more, which is a terrifying thought even though it shouldn't be, Acererak's never cared if her lovers drifted away from her before -
Finding alts with the same face as Acererak and no attached alts of Eliese or ability to beat them in a fight is pretty easy. Finding alts who'd consent to being Eliese's present (or at least be able to work with them after) is - harder. Acererak ends up spending an hour scrying most nights, paging through the multiverse.
She gets jittery as Eliese's birthday approaches and she still hasn't found anyone for sure, the time she spends scrying quickly eating into her private reading time. It's stupid. She should just settle for an unwilling her - there's so many alts of her out there anyways, several of them pretty close repeats of each other, it doesn't matter if they use up and discard one - but Eliese might be sad about that thought -
And then, two days before Eliese's birthday, her scrying stumbles on a tied up her presently being tortured - apparently for an audience.
Acererak watches, fascinated, renewing the scry when it would have run out on its own, tracking her alt through the entire session and then being untied after - the alt heals herself and smiles and laughs with her torturer, jokes about this exhibit being popular -
Apparently she has at least one alt with bizarre pastimes. Well, it works, and the alt even has the same face as her...
Acererak makes sure Eliese is otherwise occupied, leaves a note that she's stepped out for a bit and should be back within a few hours, and opens a gate to her alt's apartment.