“Marauder Rule No. 1: Off Limits” —a not-so-obeyed rule by one Sirius Orion Black.

You’d grown up in the thick of chaos—James as your twin brother made sure of that. From the time you both could walk, trouble followed like a shadow. But the rule had always been clear: the Marauders were off-limits. And more importantly, you were off-limits to them. James had made that known the first day Sirius looked at you for more than two seconds too long.

“You even think about her like that, I’ll hex you into next year,” James had warned, half-joking, half-serious, but with a glint in his eye that told Sirius he wasn’t messing around.

And for a while, Sirius obeyed. You were the younger twin—sharp, sarcastic, infuriatingly clever. You matched James in everything, outdueled Peter in every argument, made Remus laugh with your subtle wit, and made Sirius pause.

And that was the problem.

You were…dangerous. Not in a cursed dark magic kind of way, but in the way you looked at Sirius with challenge, like you could see straight through his smirks and jokes. You made him forget that there were rules—unwritten ones, especially the “Don’t fancy James’ sister” one that they all pretended wasn’t carved into the sacred Marauder code.

But Sirius wasn’t good at rules. Never had been.

He started talking to you more in between classes. Walking with you after Prefect meetings even though he definitely wasn’t a Prefect. “Accidentally” ending up next to you in the library. And when you called him out on it with a sly, “You’re risking death-by-brother, Black,” he only grinned.

“Some things are worth dying for, love.”

You thought he was joking—until you caught him staring during breakfast. Until he waited outside your class under the pretense of needing Remus but lit up when he saw you. Until he kissed you during a detention you served together (thanks to one of James’ pranks gone wrong, ironically).

It was supposed to be one kiss.

Then it became two.

Then sneaking around.

Then silence when James walked in and you two were definitely standing too close.

Then Sirius slipping notes into your bag. Then you sneaking out after curfew to meet him in the Astronomy Tower. Then him calling you “my girl” when no one was listening.

It was reckless.

It was stupid.

It was so Sirius BIack.

Now, here you were, tucked behind a tapestry in a forgotten corridor near the Charms classroom, pressed against the wall with Sirius in front of you, trying not to breathe too loudly. James was just around the corner, and you could feel his twin-sense tingling. Sirius’ eyes flicked to yours, amused.

“Think he knows?” he whispered, breath warm against your cheek.