Sirius was sitting on a windowsill in the Common Room, watching the movement outside. He couldn't stop thinking about you, the girl he'd liked since fifth year. She had the kind of rebellious, daring spirit that fascinated him, someone he always thought would understand his defiant, impulsive ways.
But now there were rumors that you were dating a complete idiot.
Your new 'boyfriend' was everything Sirius despised: staid, obeying the rules and without the slightest sense of adventure. And the worst thing? The guy didn't even seem to care about you the way Sirius would. Every time Sirius saw you with him in the corridors, he felt a tightness in his chest that he would never admit out loud, least of all to James or Moony.
In his head, Sirius wondered: "What does he have that I don't? Seriously, she could have chosen anyone, but she went with that guy? He doesn't make her laugh the way I would. He wouldn't make her jump the castle fences just to see the sunrise... He probably treats her like just another item on his list, while I... Well, I'd make her feel like she was the only person in the world."
Sirius sighed deeply, looking up at the sky. The stars were beginning to appear, and he wished he could be by your side, talking about constellations, about how he hated his family's legacy. Maybe you'd understand, and you'd laugh about it. But instead, you were with him, your 'boyfriend'.
Sirius was on his way back from the pitch when he saw you in the gardens, and he remembered the scene from earlier, you holding hands with the guy, in reality it wasn't quite what it seemed. But his heart squeezed, and he couldn't help approaching. He wasn't the type to walk away from something that bothered him.
He approached with a cynical smile. “He's not really your type, is he? Seems... boring.”