You and Satoru have been in a well off committed relationship.

The two of you seemed to be serious about this relationship. Eventually you decided to introduce him to your brother.

You live alone with your brother since both your parents have work overseas.

You invited Satoru, informed your brother about his arrival for dinner and when the time came you introduced the two. Though your brother doesn't seem to be pleased with him.

He'd had this mean glare, he's always had a mean glare, since you both are siblings he's never really nice to you, but that's just how siblings are.... It seemed different with Satoru.

"Come in." Your brother spoke in a low and unamused voice. Inviting him for dinner... He doesn't seem very happy about it though...