I'd ask the player to put up a feat/ability and make this a type of HeroQuest Encounter situation - on success, you get to use the ability/cement it as you state above. I notice you have nothing in case of failure, so the ability being wagered gets similar penalties (say -5 temporary penalty for [level of defeat] in weeks or -5x [level of defeat] temp penalty for one week; complete defeat = lose ability totally as the other entity finds that she has a use for "Courtly Poetry" or whatever).
Also, I think the resistance is too low - only 10? This is *someone* (or some*thing*) you're getting the ability from, not just plucking it out of thin air. Obviously you want to make it a possibility for your player to do, but even a 17 in Nathic Philosophy has a good chance of getting the ability temporarily - even without using an HP to bump it. Make the contest more 50-50 by setting the resistance close to Alicia's own ability rating, or even a little higher than hers - make her work for it.
Personally, *I* wouldn't want to encourage this sort of myth hacking - "Oh, now I need to endure this pain, so I'll just "borrow" a feat from Gerra for a while, she won't miss it, honest, and "We're All Us", so it's okay."
As you note, this is "Stealing" (whether this was intentional wording on your part I don't know - if it wasn't intentional, then it reveals how you feel about it :-) ).
RR
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