Interesting...
A big spoiler..........
Ibelin is not a good person. She always wants to be the center of attention. Notice the looks that arwin has been giving her in the previous chapters. He was the first person to notice that Ibelin isn't a good person like she looks. I know more spoilers but this is all for now hehehe (=・ω・=)
I think its the translation. The scanslation group i follow put in “dont order me around” so it may be that what he meant was; “you’re cute, but not enough to dictate what i can or cannot do”
I dont think of it because of cuteness, if does peridot would have been on his line of sight.
You can't resist the charm of Miss Not-So Sidekick. Iblen or whatever her name is (I'm bad with names) is getting possessive/protective over our cute Latte. That's why I feel like she said my like 'My'. She doesn't want Latte to get taken by Arwin, or staking claim that she is HER friend. Also when Arwin said, "Don't expect anything from me" I think he might be saying don't expect me to fall in love with you or be all buddy-buddy with you. Eh, just my opinions and theories, I might be wrong or right, lets just wait one more week to see what happens.