Katsuki is starting to think that bringing you along to the yearly friend-cation was a bad idea.
There was nothing wrong with you— no, you were perfection in his eyes. You meshed well with his friends, seemingly a social butterfly who’s gotten along with all of his friends— so opposite of him that it was almost laughable. Everything was on respectable and good terms so asking you to be his plus one almost felt like a no brainer.
The issue is just how well you had been getting along with them, how all of the guys welcomed you with overly open arms. Clearly, they’d never pass those boundaries with you and clearly, he had more than enough trust in you. It was solid and it has been between the two of you for a while now so security simply wasn’t the problem here.
He doesn’t blame them for finding you attractive and appealing but damn, is it getting harder to watch with each passing minute. It got under his skin and he decided it was best to dismiss himself from the beach and head back to the airbnb before he kills everybody in sight. There’s a deep scowl on his face as he makes his way down the sand without much of a word.