Simon wated for Sparky to be done, then he moved over to his digigrade brother, who jumped up and shoved his dog cock into Simon. Chris grunted and panted as his knot expanded inside Simon's ass. The sensation in first the long slippery wet shaft, wedging into to him. Then the bulge of Chris's knot pushing past his spincters, made Simon groan in pain. But as the knot expanded within him, pleasure began to fill him. The hard pulsing knot rubbing against his prosrate felt good...REAL GOOD! Before long Simon was thrusting his ass back against chris empaling himself. "Who's the dog boy?" He asked, more to himself than to chris. After all it was himself who had changed, Chris himself who had the power... Right? So why did he feel like he was the one being abused? They stayed like that for about twenty minutes, before Chris orgasmed his watery canine load. Then slowly began to deflate until he could pull his swollon knot out of Simon's body.