Sirius can't sleep.
And it should be because of the crucial geostrategic implications for Orion84 of what he's just learned.
Or it could be because of his naive fascination for other worlds, other beings.
But really, the cause of his sleepless state is none of those. And Sirius can't put his finger on what it is - only that it seems related to Remus himself, for his mind keeps on shouting at him images of the man, leaving him in no peace to sleep.
There is some kind of want in his core, and it can't be thirst, nor hunger, because they just had a proper break. And it's different but alike at the same time, because it feels like a physical need. Like an urgency in his body.
As he turns again for a million times, Remus catches him in his arms. "Hey. What's the matter, Love? Can't find sleep?"
"No, I can't!" Sirius answers, wincing at how whiny he sounds.
"You usually fall asleep quite rapidly. Any idea what may be troubling you?"
"No. I don't understand." Sirius sighs. "I'm exhausted but my body feels as if there was a rapid current speeding through it, relentlessly."
"Uh." Remus pauses, thoughtful. "And are there any images coming to your mind, along this relentless current?" Remus inquires.
Sirius blushes. Tries to avoid Remus's gaze - pointlessly, as he seems fully concentrated on his face and not about to look anywhere else.
Reluctantly he finally murmurs: "You. Teaching, there. In the memory."
"Yeah, what about it?" Remus seems as puzzled as he is.
"That's the images that are imprinting my mind," Sirius mumbles, almost inaudibly.
Remus's hearing must be excellent though, because there is a small smile growing on his face, and his eyes spark with joy and something else Sirius can't place.
"I see," Remus says, knowingly.
This is infuriating. How can he know what this urge is, when Sirius doesn't?
"Well, would you mind sharing with the class what's wrong with me, then?" Sirius almost bites, frustration threatening to take him over.
"Nothing's wrong with you, Sirius," Remus calmly states. "You're just horny, Love."