It was a trivial thing, really.
John had noticed that his socks had started to go missing.
But then there was an off-world excursion to a planet which had, according to Rodney, energy readings not unlike those of a ZPM.
So John forgot about his socks for now.
The planet was uninhabited but was found to be housing 3 almost fully charged 'baby Zeds', which weren't compatible with the big ZPMs, but could be used on separate systems, like weapons.
At least, that's what John had been able to decipher when Rodney was telling him this in his quarters later, as the words were hurried, spoken as fast as possible between heated kisses.
Then there were no words spoken for a while as John let himself get lost in the sensations of having Rodney pressed up against him, grinding and writhing, hands exploring every bit of John's skin they could reach. One final thrust had Rodney collapsing on top of John, spent and boneless.
Rodney reached between them and wrapped a hand around him, tugging once, twice, three times until John cried out, hips bucking against Rodney's grip as he came, adding to the sticky wetness on his stomach.
Rodney huffed a laugh against John's shoulder and rolled off of him, climbing out of bed and heading for the bathroom. John leaned across to grab a tissue from the nightstand, unashamedly staring at Rodney's ass as he cleaned himself up. A flash of white caught his gaze and he looked down at Rodney's feet as the other man went into the bathroom.
So, that's where his socks were going...