Hey everyone. This story was written for Pinata Club. I used the Hard Pinata Slash prompt. Warning for fade to black sex. Can be considered a companion piece to Nerves, One Month's Change, Loving You (Feels Like Breathing), and Hogsmeade Love Nest. I hope you all enjoy Sirius Interruptus.

Sirius watches in bemused silence as his younger brother is practically straddling his best friend. James moans against Regulus' mouth as the younger man starts to grind on James' lap. He sees James' hands go to Regulus' belt buckle and the hears the younger boy's insistent moans urging James onward. The belt hits the floor and before James can undress his brother further he clears his throat at this and nearly laughs as James and Regulus spring apart. He doesn't know how far the pair would have gone if he hadn't and is somewhat afraid to find out.

"How long have you been standing there, Siri?" his brother asks licking his swollen bruised lips and not meeting Sirius' eye.

"Long enough to see that my little brother was grinding on my best friend," Sirius replies with a laugh that makes both boy's faces pink slightly. He swears he can see Regulus squirm uncomfortably at this statement.

"It's not what you think, Sirius," James tells him trying to defend Regulus' name more than likely. "We were just..."

"Winding each other up for a good old fashioned humpfest. Might want to lock the door before we begin those kind of make out sessions. It could have been your Mum who walked in on this and not me. And what would she think about this?"

James goes to make a statement of some kind eyes never leaving Regulus' body. Sirius blushes a little at the thought of what James Potter does to his little brother when they are alone. He knows they have sex. He's surprised the whole neighborhood doesn't know the two boys are screwing each other. He's also surprised Mr. and Mrs. Potter have no clue. He turns to Regulus as though to say something to him.

Regulus is red now from the top of his ear down to his collar. Which only happens because on one of two things. One Regulus is turned on which it's obvious he is right now because of he interrupted a few minutes ago. The second being he's embarrassed about something which was also true because of the same reason.

"Siri," Regulus gets out around a moan, "can you come back later?"

"Sure, kid," Sirius says opening the door he had been leaning against a minute ago. He doesn't need to see this next part. It's bad enough he has to hear it on a daily basis. "One more thing before I go."

"Yes," both boys seem impatient for him to leave now.

"Lock the bloody door this time."

He leaves and is relieved to hear the door lock click behind him. At least Mr. and Mrs. Potter won't walk in on their son having sex with his boyfriend under their roof now. He hears his younger brother moan in pleasure and makes his way down the hall. Maybe he'd call up Marlene and they'd make some pillow music themselves he thinks as he head to his room the bed spring squeaking faster and faster behind him.

I hope you all enjoyed Sirius Interruptus.