As soon as Mark finishes reading the note he feels one of the dogs behind him. turning around he see's Titus, and Titus then gets up on his hind legs and starts licking Mark's face. Titus standing on his hind legs was as tall as mark, maybe a little bigger, Mark laughing at the big dogs affection decides to hug him, when he does he feels Titus's erection press against him, Mark smiles and reaches down to touch the dog's penis, Titus pants some more and licks at the center of Mark's face.
Mark then feels something touching his ass, turning around he looks at Jazz sniffing his butt, Mark then gets an idea. He strips off his clothes and gets on all fours, Titus gets riled up while Jazz looks like he's giving a seductive look at Mark, Titus goes to Marks ass while Jazz goes towards his face, he feels the two dogs get up on his back, they feel heavy but not too heavy. Jazz sticks his doggy dick into Marks mouth and Mark starts sucking and licking, Titus licks at Marks butthole a bit before he sticks his massive cock in him. Mark has never been done it with animals before, and it felt great to Mark, he wondered if Tom and Jeff trained these dogs for this, after a good while of being double penetrated by dogs they all came at the same time, Mark dranked up all of Jazz cum while Titus kept pumping load after load of cum into Marks ass.
As Mark takes it all in his body starts changing, he starts growing fur all over his body, the same as the two dogs, his nose flattens and turns black and wet, his face elongated into a muzzle, his ears became triangular and moved to the top of his head, his hands became a bit more paw like with short claws on them, a tail grows from the base of his spine and he feels it touch Titus as it wags almost on its own, his dick changes into a dogs and grows in length a bit and turns red and a knot forms at the base and a sheath forms under it, his feet became digigrade. Finally the dogs top cumming and Mark takes a look at himself, he looks half german shepherd and half human.
"Sit", as soon as Mark hears this he sits like a dog, "Oooh Jazz, he looks so cute" Mark hears from behind him "Indeed he does, Titus". Then the two dogs get into Marks view, "What did you do?" asks Mark to the dogs, "We made you ours" says Jazz, "What? But why" says Mark while whimpering like a dog, "We saw masters new friend and we wanted a taste, now lift your ass" replies Titus in a happy tone heading towards Mark, as soon as the command was made Mark lifted his ass up, still on all fours, Titus got behind him and started licking his butthole, that got Mark aroused and Jazz smiled. "We are your masters now, and you are our bitch" says Jazz as he turns around and presents himself to Mark, "Now Max, come and get it" Mark couldn't resist, the licking from Titus was getting him horny again, and he got to Jazz and started humping away at him, Titus then gets on Mark and humps him, "Thats a good boy Max, do you like fucking daddy?" Marks head is feeling fuzzy as his memories are slipping away, being replaced with new ones, he is Max and Jazz and Titus are his daddies and he is their boy toy puppy. Max replies in happy barks and pants and howls as he fucks Jazz while getting Fucked by Titus.
This weekend was the best weekend Max has evered had, his daddies played with him every day, and when Tom and Jeff came home they saw what happened to Mark, but soon accepted him like this, he was much more submissive and his new senses made the sex even greater. Max loved his life and he loved his human masters and his doggy masters, He would live happy with all of them,
THE END