Watch the full scene:
You might remember from Declan's solo shoot that he was a fan of the site (before he knew he was actually going to be doing a video for SW). He'd mentioned that Avery was one of his fave guys on the site. So, it seemed like a no-brainer to get them together for a scene.
Avery was on board. After his last scene with Chase, the "weirdness" of fucking another guy was more or less gone for him. As things got started, Avery was a bit stiff, but I think knowing that Declan was really fired up about getting to fuck him seemed to build the chemistry between them quickly.
Just watch Avery's eyes. They were glued to Declan's cock bouncing up and down on his chest, occasionally moving up to watch the look of ecstasy on Declan's face. He was clearly getting turned on by pounding Declan's ass.
When they got the thumbs-up for the cumshot, Avery bent Declan over, grabbed onto his hips and really got to work. He pulled out and shot the biggest load of any of his scenes, all over Declan's back. Declan rolled over and jerked another big load, shooting all the way up to his own shoulder.