Help me find this bl

I just remember a scene where the protagonist is eating a konbini(?) onigiri and (I believe) a friend of the guy he likes says somehting like "Oh you like those?". The protagonist feels bad because he thinks they're critizicing him for eating konbini food as it was (I think) either childish or for poor people or something like that? But later it turns out that the guy was just asking because he would rather buy onigiri that is wrapped in a way that the nori wouldn't touch the rice so it wouldn't get soggy before you eat it.
I know it's not much to go by, but maybe someone can help me? I just remembered it randomly lol