This is NOT a Father-Daughter imagine! In this, you're an angel, and you fall in love with Demon!Dean, and you plan to run away together. This MIGHT have multiple parts to it!
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"Y/N! Get to the bunker, now. Dean, he...he's back...as a demon." Sam said. I almost dropped the phone. Here's what's happened over the last two months: First, I turn out to be an angel, and Castiel's sister. Next, the love of my life dies. Then, he comes back as a demon. What else could go horribly wrong? "Okay, Sam. I'm on my way. I'll be there soon." I said.
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I zapped to the bunker after gathering a few essentials. Rock Salt, my demon blade, and matches. "What the hell happened?" You asked as soon as you saw Sam. "I don't know. One minute he was dead, and the next...he was a demon." He explained. "Shit." I muttered. "Where is he now?" Sam breathed a sigh of relief. "We have in tied up." He said, leading me down the halls of the bunker. "I was hoping if he saw you, he would get it together. He's in here." Sam said, opening a door and stepping inside. "Sammy boy! You're back!" Demon Dean said. He didn't even notice me. I couldn't take it anymore. I cleared my throat. His eyes went back to the bright green I love so much. "Y/N?" He asked. I nodded. "Yeah. It's me." I said. He smiled at me, then when he blinked, his eyes were pitch black again. "Dean, you can control this! This is a disease!" I shouted, as Sam rested a comforting hand on my shoulder. "Personally, Y/N, I like the disease." He said, cocking his head to the side and smiling. "You thought bringing Y/N into this would help me, didn't you? Well it doesn't! She can't do anything to help me! SHE'S WORTHLESS!" Dean shouted. It felt like I was being stabbed. Which is ironic, being stabbed, because it's happened before, and it hasn't hurt as much as this. "This is that damn demon. This is what it's doing to you, Dean. I know you love me. Remember that time when we went hunting for the first time? Or when you and Sam tried to prank me? Because I do. I remember our first fight. You came home with a huge teddy bear and my favorite candy. I remember when...when I had that miscarriage. You were with me every step of the way. The Dean I know would be the amazing man I fell in love with. This isn't the Dean I know." I said with tears threatening to spill. "This isn't you." He looked at me, still smirking. "It is now, Babe."

I turned away, crying, and zapped away, back to Heaven, to tell Cas everything that happened.