...remi is either jealous, or annoyed that they are doing this in her home/right in front of her (i'd wager on annoyed) ps, remi's line: イラツ does that mean "I lost"? i really dont know much japanese.
...remi is either jealous, or annoyed that they are doing this in her home/right in front of her (i'd wager on annoyed) ps, remi's line: イラツ does that mean "I lost"? i really dont much japanese.
It's an onomatopoeia for irritation.
I'm guessing that the combination of being called Aunty by her niece, not having her own man, and seeing her sister being all lovey-dovey in front of her is just too much.