A/N: this is for the RPS rare pairings challenge and the up to 50 pairings challenge.
Rodolphus pushed Sirius onto the bed.
It had been a while since the two of them had a chance to have some time alone and he couldn't wait to feel his boyfriend's skin on his.
"I think you're a little overdressed, Dolph," Sirius commented.
His toned body was on full display whilst Rodolphus was still dressed.
Slowly, Rodolphus undid his belt and pushed his trousers down to reveal that he was commando.
Sirius knew that his boyfriend liked the freedom and convenience of not having to wear underwear, and so did he.
He watched as Rodolphus started unbuttoning his shirt, and just as he was about to take it off, the door opened.
"Well what do we have here?"
Rodolphus rolled his eyes.
Trust Rabastan to interrupt, he thought.
"What does it look like, brother?" he snarled.
"It looks like you are about to have some fun. I was wondering if I could join you," he asked, sounding nervous.
"Why?" Sirius asked in return.
Both Rodolphus and Sirius were stunned.
Although Rabastan knew of their relationship, he had never shown any interest in it before.
"Because I want you. I know that this would be a one time deal, and if you say no I will walk out and never ask again."
Sirius and Rodolphus looked at each other clearly communicating silently.
After a few moments Rodolphus said, "Okay, but it will only be for tonight."
"Thank you," he said sincerely.
Rodolphus carried on undressing under Sirius' gaze and the air suddenly became warmer. The sexual tension in the room was palpable, especially after Rabastan had joined.
Rodolphus moved towards the bed and kissed Sirius roughly.
The moan that escaped made Rabastan act. He quickly took off his clothes and climbed onto the bed behind Sirius.
He leant forward, pushed the hair from the nape of Sirius' neck and kissed it lightly.
Sirius shuddered at the touch.
Breaking the kiss, Rodolphus asked, "Where do you want to start, love?"
"I don't care. So long as we're together it doesn't matter."
With that the three of them started kissing and caressing each other's bodies.
It was only the beginning of the night, but they could all tell that once any awkwardness had passed it would be a night to remember.