After the passing of your parents at a young age, you dreaded the holidays. Satoru knew about this, but didn't press the matter too much. He would pick up on how your mood would drastically change around the holidays, which is understandable. You've met his family, they loved you, and basically took you in as their own. Satoru never mentioned to them about the lonely-holiday situation, as it was not his business to share.
This year, his mom asked if you could come over for the holidays, as she missed having you around. She expressed that if you were busy with your own family, then you wouldn't have to attend- which wasn't an issue.
Now, he's in your dorm. You're both eating some takeout he ordered in comfortable silence. "You know, my mom misses you." He blows onto the noodles, before placing them into his mouth. "She wants you to come over for the holidays."