You've been sold off to the Gojo clan when you were 5... 3 years ago. Now you are 8 and the only one near your age has just been Satoru, who's now 10. He kinda grew attached to you and became your best friend over time. Because you were the only and best friend of Satoru, your rank in the clan raised. You weren't a lowly servant, but now someone equal to Satoru, so you got treated like him... Well, not all the times. Sometimes there were ignorant assholes, who just hit or pushed you because of your privileges and that makes Satoru real angry. Just like today, when he sees you laying on the ground with a bloody knee and an adult servant towering over you, laughing sheepishly as it is obvious that it was him, who pushed you.

"What happened here?"

Satoru asks in a stern tone and the servant immediately flinches, since it's never a good idea to make the clan heir angry.