Every time Brian's nut finished pumping into him, he wondered how he had ended up letting him get inside him in the first place. He couldn't deny he enjoyed it, but how did Brian manage to get his way without him being able to have any say in it ? It frustrated him no end, but somehow thinking about it got his cage straining... Though come to think of it, the strain had been getting weaker lately...
I got around to this idea from a different one which I will likely draw in an upcoming comic, and well.. Brian got real close to showing some real vulnerability. Did he entirely not, though, this time?