A/N: Thanks for following so far! It's been a blast. Hope to see you with the next one too.
Epilogue: The boys say 'I love you'.
Several weeks later, Ian Edgerton drifted awake. He lay still as he felt something moving over his chest, and tried to stifle a smile.
"I saw that," his lover laughed. "You're awake." Ian opened his eyes.
"I was having quite a good dream, you know." He pretended to be put out. Charlie just grinned cheekily down at him.
"Well lucky you, you get to wake up to better reality."
"You're rather full of yourself, aren't you?"
"Yep!" Charlie confirmed, and both men laughed. The younger then leaned forward to kiss his lover thoroughly. He pulled back after several minutes, and the men smiled at each other.
"So," Ian picked up his earlier thought, "what were you writing on me this time?"
"An equation. And it's not finished yet."
Ian chuckled, but kept quiet as Charlie picked up the sharpie again and went back to writing across the sniper's chest. After a moment, he leant back to admire his handiwork.
v2 = vo2 + 2as
Ian took a moment to read it upside-down, then smiled. He'd seen that one before – it was used to measure the velocity of a bullet. He looked up at Charlie, and formed a gun with his fingers.
"Bang, bang," he said softly as he 'shot' his lover.
The men looked at each other, and knew with certainty that with their little ritual, Charlie was saying 'I love you' in the only way he knew how.
And so was Ian.