Rodney walked into their quarters to find John sitting at the desk, glaring at his computer with such an intense, homicidal look of rage in his eyes that Rodney was very tempted to turn right back around and leave to avoid becoming a victim. But curiosity, much like for the cat, was his greatest weakness so instead of fleeing to safety like a sensible human being, he took a step closer.
John ignored him, continuing to stare burning holes into the screen as he sat rigidly in his chair, arms crossed tightly against his chest and his hands clamped hard enough to his upper arms that the skin around them had turned red-white from the pressure.
Slowly, cautiously, Rodney reached a hand out to touch him only to pull it back sharply when John growled, low and warning through clenched teeth.
That pissed Rodney off.
"What the hell is wrong with you?!" he yelled, fixing John with a glare of his own.
John glanced sideways at him for moment before returning his glare-of-death to the monitor. Lips pinched into a thin, hard line, he grunted and nodded his head at the screen, indicating that Rodney should look at it.
Rodney looked and only just managed to stifle a laugh at what he saw (the indulgent little smile he really couldn't help): an error message.
"How you've survived this long is truly a mystery," he sighed, clicking a few buttons on the keyboard before telling the computer to re-boot.
As the screen went dark, John turned his glare towards Rodney. So, Rodney kissed him - because he could, because John looked impossibly cute when he pouted, and because it really was that or laugh.