JASMINE LOVES IRIS a lot, in the dumb rivalry way. Stealing to impress/flirt with Iris gives her so many dokidokis because it also gives her the rush that she's so addicted to, since stealing for and being in a relationship with Iris feeds into how much of an adrenaline junkie she is. Though if Iris were ever in trouble Jasmine would drop everthing to go save her WITHOUT FRAMING IT IN A TSUNDERE WAY EVEN if it's a huge amount of danger. If it were something silly she'd totally be tsundere, though.

There is also some possessiveness also because Iris is mine and she'd be jealous if Iris ever did anything with anyone else because she loves Iris that much. :( Jasmine has a very big heart and Iris stole (see what I did there) it.

She does get kind of tsundere because she's pretty tsundere to people that she's affectionate with on normal terms though!

She also loves the fact that Iris pushes her because there are very few people as good at thievery as they are so WE JUST PUSH EACH OTHER TO BE THE VERY BEST aw yeah

and good no one should believe the tsundere act

now do nightingale on wren