In a June 2013 thread about whether meme should shake things up for one post by banning certain old-standby topics, one nonny suggested that people trying to introduce forbidden threads be met with derailing porn. Another nonny referred to this as “trolling” and “assholish” behavior, even after being told that derailing porn is a grand old F_FA tradition.

Eventually there was this exchange:

One post, where someone trying to start an earnest thread gets jumped on and spammed with Wincest watersports?

Yeah. Like I said. Fun.

Don't be silly, it won't be Wincest watersports.

It'll be Sterek knotting mpreg fic.

It'll be *both*.

“Man, I have to piss all the time now that my werewolf brother's knocked me up,” Dean grumbled, rolling out of the motel bed belly-first.

“No,” growled Derek, replying even though the enormous knot of his Alpha penis was still buried deep in Stiles's blushing formerly-virgin ass. “Hold it,” he whispered hypnotically. “I know you can.”

Dean rubbed his baby bump and scowled. “Yeah, and I have the UTI track record to show for it.”

“Sam,” Derek commanded. “Fuck some obedience into your brother.”

The tall Winchester snapped his laptop shut in annoyance. “Again?” But he unzipped his fly and took out his gigantic dick. In two strokes it was hard, and he coughed, looking down at it significantly. “Come on, Dean. You know the drill.”

Dean sighed and walked over to straddle his brother's lap, impaling himself on the mighty rod. “Ooh,” he said. Sam grabbed his hips and yanked him down, forcing the werewolf knot deep inside him. “Argh,” Dean said.

“Tell me about it,” Stiles moaned. Derek but him playfully in the neck, like he was a whiny pup.

“Ssam,” Dean said. “Sam, I can't – ”

“Let it go,” Sam advised, and Dean's dick jumped and splattered both their bellies in hot piss. “That's not what I meant.”

“Am I going to lose control like that when I'm knocked up?” Stiles asked worried.

“Yeah, baby, you are,” Derek said, and laughed an Alpha laugh.

[ don't know either canon, sorry ]