The dungeon door slammed open as Sirius burst through it, looking for Severus. "Come out, come out, where ever you are, little snakey!" He whimpered. His shirt was torn open to reveal his tattoos on his thin, boney chest that was heaving up and down from the chase. Severus had been running away from Sirius since he told him the news. "I can't cover this up anymore without marrying her, Snakey. You know that. You know that you are the only one that I love, though. Don't you, Sev? You know that I love you."
He grabbed onto a table to hold himself up as his legs nearly crumpled beneath him. The shadow of the chased hesitated on the lowest stair leading to Snape's office. The door quietly closed behind Severus Snape as he went into the office, giving away his position. Black became a dog and dashed down the stairs, tearing at the locked door to Snape's office, eventually tearing out the knob and breaking in, becoming a human again.
Snape was sitting in his office chair, just waiting for Sirius, very calmly. Sirius walked over to him, his clothes more torn now, with a hole in his pants just above the knee. Severus reached out a finger, tracing a circle on the skin through the hole, and Sirius tilted his head back before leaning over Snape and attacking his lips, nearly pushing the both of them on the floor behind the chair. Sev bit Sirius' lip and Sirius' filled his mouth, iron and tangy. Sirius leaned back, licking his lip and the . His eyes had rings of yellow on the outside of his black irises. His eyes were wide and hungry, and he stared at Sev's lips.
"Now, doggy, you know that we can't keep this up after you are married. It would look strange if you were always coming to Hogwarts or if I was always coming to your house. That Tonks is a smart one; she would figure it out." Snape looked down at his hands in intelligent disappointment.
Sirius took a hold of one of those hands and held it up to his scratched cheek as he laid his own hand against Snape's cheek, stroking it lightly. "No matter who either of us marries, I love you. I don't care who tells you otherwise. You know that, don't you, Sev?" He moved his hand from Sev's cheek to his chin, forcing it up, forcing Snape to look him in the eyes. "Don't you?" His eyes pleaded with Snape.
Snape looked at him, then down at the floor. "Go," was all he said. A single tear fell down Sirius' cheek, wetting Severus' middle finger.
"If that's what you want, Severus. If that's what you really want." He leaned down, pushed Snape's chin up one last time, and kissed him softly, sadly, passionately. He pulled up, "If that's what you want." He dropped Snape's hand and walked out of the office, closing the door softly behind him.