...p deep inside. He pushed his butt against his faithful friend again, and felt his entire body tighten. Santa's Little Helper whimpered. Bart couldn't believe it - his own dog was making him cum!
Bart pushed against him again, and blew his wad. He fired spurt after spurt between his skin and SLH's fur. Confused and a little scared, the dog struggled to get free, which only heightened Bart's pleasure as he rubbed himself against Santa's Little Helper's fur.
At last, Santa's Little Helper pulled free. Bart could see the large puddle of semen on his tummy, the creamy goo still trickling out of his spent penis. He could also see the slick on his dog's belly that brought him off.
Slowly, the pup padded back to Bart's side, and gave a tender lick to his master's slimy shaft. Bart reached up and petted his friend.
"Good boy!" he told him, running the fingers of his other hand through the puddle on his stomach absent-mindedly. After awhile, Bart led his faithful pet out of the room and cleaned him up. Leaving him with a doggie biscuit, he went back to the bathroom and showered.
Half an hour later, Bart laid on his bed, thumbing through an old issue of Radioactive Man, Santa's Little Helper napping quietly at the foot of the bed. The front door opened, and Marge walked in.
"Bart! We're home!" his mother called out. Bart looked at his puppy on the floo...