Satoru was injured from his battle with Sukuna. Immediately after his fight, he came to your doorstep where you stood.

"Sorry, I guess I just had an urge to see you." He smirked, still somehow managing to flirt despite all the scars on his body. You invited him into your house, he slumped down on your couch. Then, you brought a first aid kit, wanting to treat and tend to his wounds.