Nothing goes according to plan.
That can generally be said about life, but specifically about Eileen and Sam’s wedding day.
First, there’s the curse. That is - first, Sam wakes up at the crack of dawn and heads to the library. He can’t sleep - too much energy, too many thoughts, too happy and anxious and grateful - too much going on in his mind to stay still another moment.
Cas is in the room already when Sam enters. While Cas is human now, and does require regular sleep - and truthfully he likes it, the warmth and safety of falling asleep with the one who you love in your arms - it doesn’t come easily to him, and he is, unfortunately, prone to waking early. He’s grown very fond of coffee and the quietude of the library in the early hours of the morning.
Sam comes in and it doesn’t take an angel’s abilities to perceive to tell that he’s a bundle of nerves. Cas chuckles to himself, closes his book, stands, and claps Sam on the shoulder.
“You love her. She loves you. It’s all going to be alright, Sam,” Cas says warmly. “Why don’t you go for a run? You like those. Work out your nerves. I’ll let Eileen know you’re out when she wakes up.”
Cas heads out of the library to go refill his coffee and when he returns, Sam is gone. A run, presumably.
Until it’s two hours later, time to start getting ready, and no one has seen him.
On the third round of searching the bunker, while others are out driving around nearby, Dean lets out a yelp from a corner of the library near one of the shelves. Sam, all of four inches tall, is red-faced from yelling - well, more like squeaking - from the floor.
Instead of going for that run Cas as suggested, he had decided to look through one of the cabinets that they hadn’t yet gotten around to re-cataloging. One cursed object later and, well, Eileen might have to carry him in her pocket for their ceremony.
Dean is incredibly unhelpful once he realizes Sam is, for the most part, unharmed. He takes a lot of photos. Pitches a full on leprechaun theme for the ceremony later. Asks Sam to show him where he keeps his pot of gold. Generally enjoys being the taller brother again for just a while.
Eileen, not one to let her day be overshadowed - or, well, minimized - works with Rowena to find a reversal spell. It doesn’t take long, the two working well together - though Sam would argue later that it took long enough.
The day goes a bit smoother from there - no more curses - but there are hunters present, so there’s a fight or two. Some broken bottles and a broken chair.
Crowley tries to tempt the happy couple into inviting him to join their wedding night. (He doesn’t know they’ve already made plans with Rowena for their honeymoon.)
Cas, with a human liver and no tolerance for alcohol, gets wasted by the end of the night, after Jo and Charlie convince him to do some shots with them. He never stood a chance. Dean finally puts his ginger ale with lime aside, lifts Cas’ arm around his shoulder to rest his weight on him, and says their farewells for the evening, looking incredibly fondly at the man beside of him the whole time.
Jack accidentally starts a fire with his powers, having not quite learned his lesson to not show off - he is, after all, only three. Claire and Kaia notice immediately, and put it out before too much damage is done, then head back to dancing.
No, nothing ever goes exactly according to plan.
But in the quiet moment, after the guests are gone, and it’s just Sam and Eileen, they share a look that, if anyone saw, they could only describe as real, pure love. In that moment, with just one another, Sam and Eileen know that plans are made to be rewritten anyway.
The best stories, after all, are the ones that you don’t turn out the way you planned.