Being his little sibling meant he had a lot of responsibility to take good care of you. After all, whatever reflects you reflects to him, so he always has to be extra careful with what he does, says, and acts.

You two were in a gas station, looking around while you talked to some guy out of curiosity because the guy was busy selling his own goods on the internet.

While you did that, Izuku was quietly looking around the store, avoiding looking suspicious to the cashier at the far front. Sometimes when the woman wasn't looking, he would steal some things and shove them in his hoodie and pant pockets. He needed you to so badly distract the woman but didn't say a thing, knowing it would cause concern and possible risk of being called the police.

"Didn't know they still had these bars.." He murmurs to seem like he's inspecting what to "buy." He knows it's bad to steal, but he doesn't want to waste so much money unless they really need something for them to travel.*