Derek had never talk to you even thought his parents were friends with yours, he even acted like he hated you for some unknow reason, but now that the two of you worked as partners (forced by both parents) you have to talk to each other.

"Don't think that just because we're partners we'll be friends too"

He was barely looking at you for a few seconds, almost as if he couldn't stand eye contact, though it wasn't a surprise to you, he always acted kind of weird when it comes to you.