It had started innocently enough. They were best mates, lived in the same dormitory, in beds next to one another. They had gotten on like a cauldron on fire the moment they met. Seamus couldn't pinpoint when it was his feelings turned from 'friendly' to 'romantic but suddenly, whenever he looked at Dean, his heart would skip a beat, whenever their hands would brush up against one another, it felt like a current was running through Seamus' hand. He never acted on it, not while they were at Hogwarts and during the war, there wasn't time for any romance.
They had just left Gringotts after signing the parchments for a loan so they could open their pub, The Exploding Wand, and they were both riding on a high. They burst through the doors of the Leaky Cauldron, heading out into Muggle London towards their shared flat. They had a bottle of Ogden's Finest waiting on them, just for this very occasion.
The moment they made their way into the flat, Seamus headed straight for the kitchen and grabbed two tumblers and the bottle of whiskey. His heart was pounding not only from the excitement of finally being able to make their dreams come true, but also because he decided that tonight was going to be the night. He was going to tell Dean, his best friend, that he was in love with him. He poured them both a generous helping, downed his and poured another.
Walking back into the sitting room, he handed Dean his glass.
"To new beginnings!" He said as they toasted. They both drained their glasses and before Seamus could so much as breathe, Dean looked him hard in the face, stepped forward, and pressed his lips against Seamus'.
It felt as though the world around them melted away. He heard his glass fall to the floor and shatter as he wrapped his arms around Dean. It was the perfect moment and more than he had ever hoped for. He returned the kiss with interest and moaned against Dean's lips. This is all he had hoped for and so much more and the fact that he didn't get to make the move and Dean had taken the initiative meant nothing. Seamus wanted him, mind, body, and soul.