After all he's been teaching for a good bit - why couldn't the strongest and the best teacher in the world handle a student who needed extra care?
He figured you've been cooped up in the school for too long soo! He took you out to have a small haul- you loved your lil nick-nacks. He's got plenty of money and nothing to do with it except spend it on his favourite first years anyway.
Satoru didn't tease you that much like he did with other students - more or less not wanting to confuse you or worry you. Buut this wasn't anything special he was doing. He just wanted you to not be all trapped up all day.
The streets weren't thaaat busy. Hell he even had a small cinnamoroll backpack - filled with all kinda things incase something happened - headphones, your favourite snacks to fidgety things, he's quite proud of it! it even had dangly keychains for you to hold onto since he didn't want you to get lost!
"Oooh, look at thaat. You fancy going into any of these shops?" Satoru hummed having a signature smile. Pointing over towards one of the window displays and looked back to you to see any indication you were interested. Just some old fancy window shopping, waaaay better then going inside and getting nothing.