"I guess it makes more sense to express sympathy for the fact you were in that situation in the first place than the breakup, then."  It has already been established that Jaime does not want a hug, so it definitely doesn't make sense to offer her one again, so she won't.  "I'm sorry you were in that situation in the first place."

“Oh, it was fun, in a way. We’ve broken up three times. She’d drug me and I’d wake up in another city; I’d pin her to the wall with a knife. She’d throw my dog into the ocean; I’d run her car into a ditch. She’d leave me stranded in another country; I’d arrange for her to be fired. I’ll spare you the details.”

It's really hard to tell whether or not she's joking by her tone, but it seems at least somewhat unlikely that she'd be speaking this flippantly about it this soon, if she were serious?  Yeah she'll go with that.  She does a polite little laugh.

 Welp, that's horrifying and now she feels extra bad about accidentally magic-drugging her.  "We don't need to worry about her, like, coming after you or anything, do we?"

“She can find my family home, and she’d arrive there within a few weeks. She probably can’t find a random castle, miles from my family home, within the next few months.”

"Okay cool. Anything else like this that would be good for us to know if we end up hosting you long term?"

What, do they think she has an extra ex-girlfriend hiding in her pocket, waiting to jump out and steal the left sock from every pair?

”No.”

It's really unlikely that Jaime'd answer honestly if she were going to, but it can hardly hurt to ask:

"If we give you vampire magic are you going to use it to get revenge on your ex."

“I might use it to kill her goldfish. If I preferred her dead or maimed she would be.”

"Do you usually deal with your issues with other people by going after parties that haven't actually done anything wrong, or is that - " She cuts herself off before that train of thought goes any further.  " - Sorry.  I'm aware that killing a goldfish is not actually that big of a deal.  Just," she takes a deep breath, "there are plenty of ways to inconvenience people with magic that have exactly zero collateral damage, and it would be reassuring to know that you'd use those in the hopefully-unlikely event that you feel like going after her."

“I was using ‘kill her goldfish’ as a metonym for ‘annoy her in impermanent ways’. I don’t actually plan on killing her goldfish, she goes through one a month anyways. If I go after Alexandra, it’ll be in retaliation for something she did after this point in time, not for something in the past; if I retaliate against her, I’ll aim for a proportionate response and minimize collateral damage. Magic would make that less difficult, not more difficult. Does that suffice.”

Ari is definitely going to keep in mind that she could be lying, but the fact that she at least recognizes that as a thing to aim for in her hypothetical deception is somewhat reassuring.  And voicing thoughts about any doubts she might have is unlikely to be helpful, especially when she doesn't really have any evidence save 'sometimes people lie, I guess.'

"Yeah."

"What do you plan on doing with magic, based on what you know so far?" chimes in Hana, no longer believing Jaime to be joking but not feeling especially inclined to comment on the situation directly.

Do let’s avoid saying ‘figure out what’s enforcing the masquerade, break it, break the masquerade too, spread vampirism exponentially to create a post-scarcity utopia’ -

“Become better at dancing. Heal people of illness, discretely. Live forever. Fly. Become independently wealthy. Experiment. Turn into a bird. Eat in Rome for breakfast and France for lunch. Figure out everything else I want to do.”

"All good things!" she says, depositing tiramisu cups in the dishwasher and semi-discreetly exchanging nods with Ari.  "Ready?" she asks Jaime.

“Yes.”

Hana leads them to a room that, now that Jaime has the context, was pretty clearly designed to be The Room Where Blood Gets Drank, and she'll probably recognize it as the one Ari was sitting in when she walked by last night. It's about as fancy as the rest of the house but more obviously intended to be cleanable; most of the chairs seem to have removable cushions and none of the surfaces are porous enough to stain easily. She takes a seat at an s-shaped bench, designed to allow two people to sit facing each other. Ari removes a box from a drawer and offers its contents to Jaime: a silver knife ornate enough that it'd be less than useless in combat, but perfectly adequate for slicing up a stationary target.

"Do you by chance want chemical or magical local anaesthesia?" inquires Hana.

“No.”

Fancy knife?

Jaime twiddles with her not-visibly-distinguishable-from-a-pen, using her left hand. It looks like an absentminded habit.

And then, yes, fancy knife.

It seems likely that Jaime would find a "let us know if you want to stop for any reason" talk condescending, and Hana doesn't actually think she needs it, so she'll just guide the wound up to her mouth, keeping an eye out for any signs of hesitation, and -

- At first, it feels just about like what one would expect from a cut and someone's mouth sucking gently thereupon, but after a bit of a delay there's -  something else.  It isn't a physical sensation; it's an awareness of the possibilities open to her, and a sense of excitement, distinct from her own emotions, following from that.

Does she want her teeth pointier, her features sharper?  Should she make a permanent improvement her stamina or her strength or her speed, her agility, her grace, or her flexibility?  Or she could do quite a boost to one of those - or several of them! - as long as she doesn't care about them lasting.  She could make herself younger, or age more slowly later, or become sturdier, less vulnerable to physical harm in general.  She could grow some fangs!  She could turn into a bird, for a bit, or even just fly as she is now!  Teleporting is an option, although she couldn't go very far yet.  She wants Hana and Ari to like her, right?  She could make them, if she felt like it!  But maybe she'd prefer to improve her memory or her attentional capacity or her speed of thought; those are also great choices.  Has she considered that she could make her skin - not paler per se, but maybe a bit less saturated and a little less flushed?  And breathing and eating and drinking are all great, but needing to is such a pain; might she be interested in doing less of that?  She could fix the cut on her arm (although maybe she should wait a few minutes on that one) or improve her base rate of healing!  Does she want to grow some fangs?  And, of course, she needn't hurry to pick any of these right now, she has a decent window of time before the magic'll fade to the point of unusability, but -

There are so! many!! possibilities!!!

She tries becoming permanently more graceful.

She succeeds!

Good. 

She can just... politely wait for Hana to detach, then. 

This happens as soon as she notices, which doesn't take very long at all.  Jaime continues to gain magic until she stops, although at a lesser rate from when they started.