my younger brother just became my knight in shining armor at the convenience store

so i ran into my close younger brother outside the convenience store and he's like "noona your birthday was a few days ago right, let me buy you some bread." i'm thinking what's the catch here but whatever we go in. he pays for it and i'm thanking him and we're just talking when suddenly this guy from my class walks up and goes "eating bread again? you're gonna get fat" and just TAKES my bread. so i'm reaching out to grab it back from him and my brother grabs my arm. he just stares at this guy with the coldest look and tells him "i'll just buy her another one. don't follow us." and i literally could not breathe. the way that was so... protective??? like that's when i realized my little brother just became a WHOLE man. i can't