Derek drives to the stilinski house and knocks. "Come in." The sheriff calls.
Derek walks in to where the sheriff is sitting at the kitchen table. "Hello sheriff."
"Have a seat Derek. Where's Stiles?"
"He’s back at my place sleeping. He didn’t want to come."
The sheriff nods and Derek sits in a chair across from him. "Well Derek how are you?"
"I'm great sheriff. How are you?"
"Derek please call me Frank. I'm great as well." Derek nods "As Stiles has probably warned you, I want to talk about your relationship."
Derek grimaces, "Yes sir, ask anything and I will answer it honestly."
Franks smiles and nods, "Well how did you and Stiles meet?"
"It was in the woods. I was walking around my property when I saw two boys."
Frank smiles, "Stiles is a nosy little shit."
Derek laughs, "Yeah but I love him, so I don't mind half the time."
Frank smiles, "How did you get caught up in a sexual relationship with my son?"
Derek frowns, "Well it started the day after I healed from being shot. He took care of me. I fell for him. He kissed me and it went from there."
Frank nods, "Who shot you? So it was Stiles who made the first move?"
"It was Kate argent. Yes sir he made the first move and it was he that topped then and since then except twice." Derek answers.
"I'm sorry about that son." Derek nods, "So you weren't kidding about honesty."
Derek chuckles, "No I wasn't, did I give to much information?"
Frank smiles, "Yeah you did but that’s ok. So from that first time up to when I walked in on you guys, you came when Stiles called."
Derek nods but says nothing.
"Well Derek I'm glad I got you two to talk. You are together in a relationship now?"
"Yes sir, we have a relationship now thank you for that." Derek smiles
Frank smiles, "I really like you Derek, you’re good for Stiles."
"Thank you sir, I love him dearly. Your approval means a lot."
Frank smiles, "I was wrong about you."
Derek frowns, "What do you mean?"
"Well when the murders started happening I realized they all had something to with the fire. I couldn't understand why you would do it. Sure revenge but why start with your sister."
Derek still frowning nods, "I understand sheriff. I look rough and mean who wouldn’t suspect me of murder."
The sheriff chuckles, "That's just it, I didn't think it was you Derek but that's where every shred of evidence pointed. I was shocked when we realized it was Kate argent."
Derek smiles, "Thank you sir." Just then Derek's phone rang, "Excuse me sheriff it's Stiles."
"Go ahead I'll be here." Frank waves him off.
Derek walks down the hall and answers the phone. "What babe? I'm still talking to your father."
Derek can hear something like skin on skin and Stiles is breathing hard. "God Derek I'm so hard, I was thinking of you."