Marco froze up as Cal thrust all the way into Marco, giving him a huge helping of that sticky load that was not going to come back out easily. Marco could only grunt and grunt helplessly as he was flooded with the stallion's seed, a good amount reach up into the collie's belly. Of course, this got Marco to cum once again, further adding to his previous load on the ground. Cal had let out quite a lot inside the pup, but he still had enough to further stain Marco's fur on his back and ass cheeks, almost as if marking his property. Marco hung there in the swing gasping for air, a good deal of sweat and seed dripping from his body then. He felt far too exhausted to move right now, his ass cheeks aching and his insides feeling so hot with all the seed inside. It wasn't the most comfortable position, but Marco quickly knocked out, his body reaching its limits then.