"I know." Megan said, her eyes welling up. "I know this is home, but you're probably waiting in the future with that worried sick look, and Mom's probably about to have a heart attack waiting on us..." she was going home, she told herself. She had to think about it that way, otherwise she was going to lose it right here and now, and the last thing any of them needed was to upset the people here wondering what happened. She was going somewhere, Ben and Nat likely were too, and it probably wasn't the sort of place where you could send a postcard once you reached your destination to say you were there safe and sound. She wouldn't worry her parents.
Mary sat up, resting her hand on top of the one John had on Megan's shoulder. "She's right, you know." To try to give them both the strength to face this, she took his free hand and rested it on her stomach. We're not losing her, She reminded herself. She was just entrusted to us for a little while, and now she's going home to us in the future and we'll meet her again in a few months. We'll raise her, we'll get those firsts, and this beautiful girl will get to have her first love, her first kiss, her first everything where the people who raised her can support her. This is NOT goodbye, Mary WInchester.
"She's right. You're probably the one pulling her back, you know that? I've never seen you more determined than you are with your children, John, and you can put your foot down and say no all you want, but even you aren't stubborn enough to keep this girl here when the man who raised her wants her home."