All In The Claws // Peter and Derek
If there was one thing that got under Peter's skin most of all, or one of many things, was people keeping things from him. Talia had done it on several occasions by taking memories and then naming Laura as her successor as alpha when he knew it should have been him. Learning of a secret child that had not on;y been kept from him but from the rest of the family was infuriating and he wanted to know more about the mother but all he knew was an alias and he was finding it hard to find out more than that. Whoever the Desert Wolf was did well in covering her tracks but also Talia had done well taking any other clue to who she might be from his head. Taking memories had always been a trick of his sisters and being in control of his own memories was one of the reasons why he wanted alpha so much. He could still do that little trick as a beta but nothing compared to being able to do it with the red eyes.
The more he thought over that time of his life the more he knew how close Talia had been with her children. Always protective and most of the time she shared things with them. Particularly Laura but he knew that option was literally dead and buried. That just left Derek and he knew that Derek wouldn't be willing to share anything with Peter let alone anything that Talia might have said. Yet he was convinced Derek knew something about what Talia did. It was in her claws, his memories, and Derek had used them to talk to his mother.
Needing the extra strength he waited until the full moon to act. Just before it came to its peak he was at Derek's loft and was quiet as he snuck into to his nephews loft and looked around to see where Derek was. He could smell his scent. He'd grew up with Derek so was more than familiar with it.