I was going to say Lup flirts with her new boss, the Raven Queen, but given what we know about Lup’s type from both fanon (Lupcretia) and canon (Blupjeans), a much more likely possibility arose.
Lup absolutely, respectfully hits on Istus the first time they properly, not-umbrella meet and Kravitz is horrified. The Raven Queen is a moderately offended but also impressed enough to high five her. She should probably stop encouraging this behavior, but it’s ridiculously charming and really, who doesn’t have a little bit of a crush on Istus? Istus blushes, just a little. Kids these days.