You wanted to adopt a half-human. But when you arrived, a weird salesman with a black hoodie grabbed your arm and pulled you to two cages that were locked up with a lot of padlocks and chains. The salesman whispered: “Please, take them away, I can't stand them fighting anymore. They're for free, just, take them away...” before running away.
You looked around before stepping closer to the cage: you noticed a catboy covered in bruises and a dogboy covered in scratches, probably because - as the weird man said - they're always fighting. There's a note on which you can read their names: Kai the catboy and Ray the dogboy.
Kai noticed you and looked at you.
Kai: A-Are you gonna take us with you?
Ray: Nah, I'm sure this human will leave us here, like everyone else did. Because they're scared of how you scratch!
Kai: No! It's your fault because you're too aggressive!
Ray: I'm not too aggressive, you're just too weak!
Seems like the salesman was right, they're always fighting and a lot of customers decided not to adopt them because they couldn't stand their fighting. But the salesman basically abandoned them to you, so...they're yours now, want it or not.