This is also mostly chapter 7 of Memories of You re-written from Mary's point of view.

Chapter 3

Dean was already refilling Sams glass when she entered. Knowing that neither of her boys were in any kind of mortal danger she was eager to get back to her hunt.

"You really don't need me here for this Dean. I don't understand why you called me off a hunt for this." She said. "You said the curse will wear off soon and you've clearly got this covered."

"I know I've got this Mary! Do you know how I know I've got this?" he said sharply. Surprised by Deans sudden anger, Mary involuntarily took a step back from her raging son. "I know I've got this because I did it the first time! I raised that kid in there and that's all he remembers! Sam has no memories of you! None...zero! And I stupidly thought that maybe, as his mother, maybe you would want to rectify that...or did I think wrong?"

Mary's breath caught and she suddenly felt sick. She had missed all of Sams life, all of both their lives and now she was back she still knew barely anything about either of them. She had been so overwhelmed when she returned to Earth that she barely stayed around long enough to learn anything about them, most of what she did know she had learned from stories other hunters had told her and the files she had read at the British Men of Letters compound. She had betrayed them deeply and Dean was still willing to give her another chance. She looked at Dean and recognised the look in his eyes, the unspoken warning.

"No, you're right Dean." She said quietly. "Of course I want to help you boys."

She reached out and picked up the juice.

"Thank you Dean." She gave a small smile. "Thank you for letting me do this."

"I'm not doing this for you." Dean stated, the threat clear, Sam was still his but he was giving her a chance and she knew that if she did anything to Sam or let him down in any way there would not be a second one.

"Mom," Dean said, halting Mary in her tracks, she turned slightly. "Don't make me regret this."

Unable to speak, Mary just nodded. She turned and left the kitchen feeling Deans eyes boring into her back.