Supernatural 4.16 Who did break the first seal? Dean & Alistair

Cas gave the note to Meg. “Keep it somewhere safe” he warned her and she put it in her pocket. “Hey, Meg, have you checked the top floor? I think you should. Who knows what treasures you might find”
Meg saw how Cas was gazing at Mrs. Jones and realized he was about to get really started. “Can I take whatever I want?” she asked in a serious tone.
“Absolutely. Knock yourself out” Cas permitted her as if Mrs. Jones possessions belonged to him. Meg left the room and Cas put his chair closer to Mrs. Jones.
“Alone at last” he said soft.
“Listen, you can still go back” Mrs....

Alright I know I started a Fan Fiction a few mouths ago but it was just ... not there. But This one will be good and I will finish it, i have big idea's for it!

Dean stared blankly at the ceiling of the dirty motel room trying to find a peaceful thought to fall asleep on, but his mind was racing with questions and no one had the answers too. Everything was on his shoulders, stopping the apocalypse, taking care of Sammy, trying not to get killed. Just one day, one day he wanted for himself, but he knew he would never get it. It was strange, four years ago Dean never would have dreamed about...