So I decided I'm going to make this a short fic of five little chapters. After this were will be two chapters with each three memories Narcissa has.
OoO
"Sirius? Who are these people?" Hermione lifted a picture from one of the cabinets, looking at the man curiously. It was an obviously old one, with two Hogwarts students standing close together; their arms wrapped around each other's waist as they laughed and chuckled at the camera.
Sirius looked at it and grinned slightly before immediately putting the picture back. "That's me, the left one is my cousin. Narcissa Black, you'd know her as Narcissa Malfoy these days."
"I wouldn't have imagined you were close, considering… everything."
"We're not, really. Never were."
Ooo
Sirius looked up when he felt two arms wrap around his waist, immediately followed by a kiss in his shoulder. "Cissa?" He grinned when the kisses moved up to his neck. "Or else please obliviate yourself immediately, no one's supposed to know that."
The blonde chuckled, "do tell me how you'd react if that hadn't been me?" she mumbled, standing next to him with one of her arms still wrapped around him. "Can't imagine the surprise on their face at that revelation."
He grinned at the shorter girl, then lifted her up as she wrapped her legs around him with raised eyebrows. "Doesn't answer my question, dearest cousin."
Ooo
They were sitting together in her dormitory, a bottle of firewhiskey between them that they were taking shots out. "If anyone sees you here, or sees how empty this bottle is, I'm dead Sirius." Narcissa muttered, resting her head on his shoulder with a tired sigh.
"I'd almost worry for you." Sirius answered with a grin, earning him an elbow in his side. "Love you?" he asked quickly, pecking her lips chuckling. "Sorry?"
Instead of letting it at that, as most of their kisses had been so they could at least pretend it was nothing but a platonic thing, Narcissa's hands took hold of his shoulders and she kissed him again. This time both of them were obviously nervous, both of them were blushing deeply, but neither wished to end it just yet.
Eventually Sirius pulled away a little, his cheeks flushed as he grinned up at her. "Not sure where that came from, but Merlin we're going to do that more often."
Ooo
Sirius drifted on his back in the water, his head drifting just above Narcissa's lap. She was sitting against the side of the bath in the prefect bathroom, holding him just close enough to slowly wash his hair.
They'd made sure no one else would enter the bathroom for a few hours, and like this it felt as if they were the only two in the world. Narcissa eventually rinsed his hair and leaned in to kiss him, chuckling softly at how odd it felt to do so when he was upside down.
Sirius laughed, sitting up only to splash some of the water on her before quickly swimming away from her when she went to do the same. Narcissa caught up on him, pulling him down by grabbing the boy's hips as she laughed as well.
Ooo
"Like you said, we were much too different to be close." Sirius shrugged, taking another glance at the picture with a smile. "But it's still family, gotta count for something."