balefully? I know you asked for Remus/James, but this kind of came out instead. Sorry. It's for you if you want it, although I won't mind if you don't because it's not very nice, and as well as Remus/James, also has some James/Sirius, Remus/Sirius and quite a bit of James/Regulus. I'm surprised the boy hasn't worn himself out, quite frankly. It's fairly porny, and James is a bit of a bastard, I'm afraid.
James is filled with seething, righteous anger the first time he catches Sirius with his hand down Remus’ trousers, lip caught between his teeth as he watches his hand on his friend’s prick. He has to go and bully Sirius’ bratty little brother to calm himself down, and calling Regulus a filthy, traitorous whore is almost catharsis enough, except that his bewildered expression and flushed cheeks make him look all too innocent, and he can’t quite imagine perfect little Regulus doing something so sordid as give a hand job to another boy.
He makes Regulus jerk him off in the corridor, and he almost pushes him away in disgust when he catches his soft bottom lip between his teeth, and for a moment looks so sinfully like Sirius that James can hardly stand it. He makes sure to spill over Regulus’ pristine robes, and leaves the boy trembling before he even has time to make sense of what just happened.
James feels sick every time he notices Remus and Sirius touching in that way that they do now, thinking they’re so clever and subtle, and he has to bite his tongue when Sirius smiles brilliantly and Remus’ face lights up in its reflection.
It doesn’t take much for him to have Remus pinned to Sirius’ bedpost, and Remus is so desperate and wanting that he almost feels outraged on Sirius’ behalf. Still, it doesn’t stop him from easing him down onto Sirius’ bed and getting a hand down his trousers. Remus is hard: it makes him feel slightly less guilty as he wriggles his trousers down and ruts against him, whispering filth into his cheek because he doesn’t want to see Remus’ face as their pricks slide together.
It’s all over too quickly, and he doesn’t bother to charm Sirius’ sheets clean: he wants him to see. More than that, he wants him to know, but he can hardly leave his signature on the soiled sheets, however much he wants to.
Remus doesn’t speak to him for three days, and James tries not to remember the way Remus breathed Sirius’ name into his neck when he came.
A few sloppy blow jobs from Regulus and James starts to hate Sirius a little less; but it still doesn’t stop him from pushing Sirius against the tiles in the shower and telling him exactly how Remus squirmed beneath him on his bed as he wraps a hand around his cock. Sirius comes with a twisted snarl and then punches him in the face, and James fucks Regulus for the first time, his face pressed to the slimy stones of the dungeon wall. When he roughly jerks the boy off, he can almost pretend that it’s Sirius who cries his name as he spills over his hand, trembling and needy for him.
Afterwards, James does up his flies with shaking fingers and calls Regulus a fucking queer. He doesn’t think about what it means when he realises that he wants to do it again, and to see if Regulus looks like his brother when he comes.
The next time he grabs Regulus and presses him to the wall, already hard and wanting, Regulus draws his wand on him and then slaps him sharply across the cheek. They fuck in an empty classroom, and James is left with the marks of Regulus’ teeth and nails and doesn’t bother to charm them away. He wonders if Regulus does the same.
Remus and Sirius are fucking; James catches them at it after the full moon, and Sirius is so gentle with Remus that it almost hurts. He tries to kiss Regulus, just to see what it’s like, and is rewarded with another slap and a vicious string of curses. Deprived of a pretty pureblood arse to fuck, he has to wank instead and try not to think of Regulus’ perfect lips wrapped around his cock.
He finally manages to drag Regulus up to his dormitory underneath his invisibility cloak, amazed at his own recklessness in bringing a Slytherin into the Tower. He makes Regulus ride him, and the look on Sirius’ face when he arrives just in time to see his little brother come as he fucks himself on James’ cock almost makes up for it all.
James just smiles smugly and asks Sirius if Remus makes him come like that.