Katy and Cal were sitting on the couch looking at their mom's magazines when Mark came out of the bedroom.
Mark sat down in Jim's recliner, is red shaft retreating into it's sheath.
Cal asks, "Where's my Dad?"
Mark smiles, "He and Buster are going at it right now. I felt bad not sharing with him." Cal gets up and goes over to sit in Mark's lap. Mark hugs Cal's body into him, "Nice shorts, they show that canine pussy well."
"Katy deserves the credit." noted Cal.
Mark says, "Your dad changed differently than us. I did what you said, put on the collar, and then take off the collar as the dildo slides in. Your dad turned into a canine anthro hermaphrodite." Mark tried to look sorry.
Katy says, "A what? He can't go to work like that. Change him back."
"He doesn't want to. And he is having a great time with Buster and Me." said Mark.
Cal looks to his sister and then to Mark, "How will my dad go to work and earn a living if he remains as he is? You and I both look and pass for human."
Mark says, "You don't look normal wearing those shorts in public."
Cal smiles, "But I am going to."
Mark rolls his eyes at Cal. "Your dad is a problem. First we have to return him to normal. Sooner or later, he will become exhausted from the constant sex. That Buster is one great dog, because I could not outlast your dad." Mark moves a hand between Cal's legs and plays with his clit though the tight fabric.
Cal smiles, "Keep it up and you and I will have to go back to my room for a while. Do you want me to be a canine anthro hermaphrodite?"
Mark puts his hands back around Cal's torso, "I need you to look normal so we can live a normal life. I am going to need your help with your dad."
Cal sighs, "Fine. Just as long as my mom doesn't see him this way."
Cal gets up, followed by Mark, as they walk back to the master bedroom. Cal sees his father for the first time, the form still human in shape, but with all great dane features from muzzle, fur, and tail.
Cal walks in, with Mark following.