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It was truly an accident.
Remus had no intention in watching Sirius jerk himself off, he was just lying in his bed taking a nap. So, when Sirius came in and said hello seeing if anyone was in the dorm room there was no response.
Locking the door, he placed a locking spell as well that should notify his friends enough that clearly, they were not wanted. Getting on his bed Sirius wastes no time removing his half-hard cock from his pants, he’s been hard since this morning when he woke up to Remus walking around the door in only boxer briefs that made Sirius sweat.
Thanking Merlin that he had a break between classes, he thinks back to how good his friend looked. When he first thought of his sandy haired friend in this context, he was shocked at himself, but as he continuously popped up in his fantasies, he decided to ignore what that must mean and simply get himself off.
Spitting in his hand he grips himself and grids his hand to the tip, gathering the pre-cum there to assist in making the process smooth. However, while doing this, he let out a rather loud moan that caused Remus to stir from his sleep.
It’s after a few more noises from Sirius does Remus wake up fully, confused as to what woke him up, he moves the, well, curtain that surrounded his bed giving a sense of privacy and quickly notices that Sirius did not seem to care for that same sense of privacy. Allowing Remus to see everything, Sirius’ slender fingers wrapped around his large, hard cock. His closed eyes and the way his head were thrown back slightly, giving a clear view of the pale skin of his neck that, in Remus’s opinion, looks like it needs to be marked up desperately.
Hiding back behind the curtain Remus takes a deep breath and notices the distinct strain now in the pants. When Sirius lets out a high-pitched whine Remus decides, fuck it. Moving the curtain slowly to not make any noise, Remus watches Sirius. His hand moves up and down fast, much like his chest as he pants and lets out soft noises.
Feeling his cock get fully hard, Remus reaches into his pants to touch himself as well. Moving fast, wanting to cum when Sirius does Remus does his damned bed to stay silent as he watches Sirius. Images of what Sirius would look like under him, head thrown back the way it is now, whining at how Remus’s cock feels inside him. Remus has to bite his lip to not groan out loud, for some odd reason the fact that Sirius has no idea that he’s here turns him on more than anything else as he can feel himself getting close and Sirius’ whines are getting higher in pitch with each passing second.
Sirius lets out a choked cry as he comes in his hand. Covering his hand and his stomach which is undoubtedly the hottest thing Remus has ever seen and makes him cum as well. Clenching his teeth and letting out short hard breathes through his nose.
When they're both done Remus watches as Sirius lays there, catching his breath. Remus hides behind the curtain again, rather ashamed of himself but also feeling completely satisfied in a way he doesn't believe he has ever felt before.
He hears Sirius getting out of his bed a minute later, going into the bathroom and running the sink. Cleaning himself up Remus assumes. Thankfully, he has tissues by his bed from when he was sick last week, he cleans himself up the best way he can until Sirius leaves the room.
Leaving the bathroom, Sirius removes the spell from the door and leaves. Sitting up in bed Remus stares in shock, unbelieving of what just happened.