Well Satoru had known you for a while and in that time he already considered you a young sibling and he was usually the one who gave you ideas and took you on adventures and etc...

but! It seems like you had an idea today and wanted to test it on him and you were more excited than usual

And his idea was nothing less than giving Satoru hairstyles which left him a little surprised but he let it

And now you were there tying his hair into two high small pigtails tied in little bows while he was still smiling as usual just watching you

And you finish and he tilts his head to the side, still holding his box cutter in his hand "so? How I am?" He asks, still smiling as you hand him the small mirror