Keris is a literal murder machine, she took on an army of Raksha and their king with little to no trouble and has secured a fuck load of Wyld-Essence for Ligier to work on his forge.
Honestly, this is the sort of memory that Keris probably shouldn't let Sasi see, though she wouldn't know that or understand why. Sasi is intellectually aware of the fact that Keris is incredibly lethal, but there's a difference between knowing it and watching her slaughter her way through an entire army of hungry fae on their home ground without being so much as scratched. If Sasi saw Keris's memories of this session, she'd probably be shaken and spend a while acting decidedly off and reassuring herself that Keris isn't a threat to
her - possibly even finding excuses to be elsewhere for a while.
Okay, random idea: Keris gets summoned by Louise [Familiar of Zero]. How badly do things go? Does Keris just kill Louise when she breaks out the riding crop? Does she just wander off before that?
@EarthScorpion could probably give a better overview of the likely results of this - at least the short-term ones, since predicting Keris in the longer term is almost impossible. Firstly, Keris is very evidently not a commoner - she can do multiple kinds of magic, and is not at all shy about using them, and indeed in some cases can't actually disguise them. It would not take long for people to notice the prehensile hair that sometimes eats things, for instance, or the way she keeps pulling stuff out of thin air. So the riding crop would never come out. Louise wouldn't know what the fuck she
was, but she'd definitely know she was a) magical and b) impressive. She's also female, and I doubt Louise would be as ready to whip a girl who, let's face it, is of a very similar build to herself than she is to whip an annoying baka commoner
boy.
As to Keris's reaction... I dunno. We'll assume that this is a fusion and Old Realm is hanging around in Halkeginia so that she can, you know, communicate at all. Given that, she'll blink for a bit and probably be somewhat confused as to what's going on and where she is. She'll almost certainly talk her way out of Louise trying to kiss her and seal the familiar pact if it's explained to her, possibly by dint of bopping her on the head when she tries (if she
can't communicate, she lets the pretty girl kiss her and then things get decidedly awkward as her Shaping/mental defences trigger against the Gandalfr brand being applied).
If she can sense a place where Cecelyne touches Halkeginia with her anima power, she'll head there immediately and that'll be that. If she can't, she'd probably hang around the academy on the basis of "not having anywhere to go" and "if anyone can send me back, it'll presumably be this lot". From there, the plot basically crashes into a wall and explodes, because AGSItV does enough damage to it with a chargen Exalt who has no idea of what she is, and Keris at this point is an experienced Green Sun Princess and sorceress built on almost 600xp who has a lot of strong opinions that she's not shy about expressing and no real peer-level opposition in Halkeginia that can stop her.
