Sherlock's wand arm trembled as he faced the Death Eater across from him. The Death Eater with his wand thrust under John's chin.
"Now, things are really simple, Holmes," the man snarled, "Give us the weapon or I'll blow your little boyfriend's head off."
"I don't have it! Please, just key him go! I swear to you, I don't have it!" Sherlock pleaded. Usually he was so calm, so composed, but this was John. This was the boy who had stuck with him through think and thin. This was the boy he loved.
"Oh, I know you have it, Holmes. A friend of mine saw you take it. Now, where is it?" he shouted.
"I don't have it!" Sherlock denied.
"So that's the way it's gonna be, huh. Alright. Here's what we're gonna do. I'm going to count to three, and you're gonna tell me where it is, or I'm gonna shoot Watson. One!"
"I don't have it!"
"It's not here, I don't have it!"
"I'm prepared to believe you any second now!"
"Wait!" Sherlock interrupted, and the man paused. He took a deep breath, "Vatican Cameos!"
Fortunately John, not as helpless as he seemed, understood the meaning and dove to the side as Sherlock's Killing Curse hit the man. John scrambled up and the two wizards stood back to back.
"Now we fight?" John asked.
"Now we fight," Sherlock confirmed. They ducked as the Death Eaters' first wave of spells flew towards them, and countered with their own spells. Beams of red and green light flew through the air, and John and Sherlock ducked and weaved, dodging all of the attacks while always watching each other's back.
Before long, the room fell silent as the final Dark wizard was felled. Sherlock ran around, checking that the Death Eaters weren't faking, and John collapsed against a pillar, breathing heavily.
"That was... ridiculous," he panted, "That was... the most bloody ridiculous thing... I've ever done!"
"And you competed in the Triwizard Tournament!" Sherlock teased.
"That wasn't just me!" John protested, laughing. He pushed off the ground and walked over to where Sherlock stood, "Don't do anything like that ever again. I don't want to see you get hurt."
"Don't worry about me, I'll be fine," Sherlock murmured, "It's you I worry about. It's not too late for you, you know. You can still walk away from this. You can be safe."
"Sherlock Holmes, you are an idiot!" John shouted, then crashed his lips into Sherlock's. It was a deep kiss, full of passion and love. Sherlock could feel the fire spreading through his body, fuelling the desperate feelings deep within him.
John finally pulled away, pressing their foreheads together, "I'm not going anywhere."
"John, I-"
"Behind you!" John suddenly shrieked. Sherlock whirled around, but knew it was too late to do anything but watch as the Death Eater (apparently not Stunned, then) shouted an incantation, and a bolt of green light shot out of his wand and hit Sherlock square in the chest.