Luke grimaced as his guts seemed to twist, and then dropped the bundle of clothes when he looked down to see two rows of nipples appearing on his chest and belly. "Oh, wow!" It was weird to see, and even weirder to feel as he touched the new protrusions. The former boy got very interested in Luke's new cunt again, and this time Luke leaned over to present himself voluntarily.. The male needed no further prompting, and covered Luke in a single thrust that got the Great Dane's cock deep inside. The pleasure was much greater for Luke this time, along with a curious sense of being incomplete. He wanted to be a full Great Dane for the male.
The mating lasted much longer this time, and Luke felt the transformation spread. He closed his eyes and pictured himself as a bitch - it was easy to do, and he felt the changes accelerate. Looking down, he saw his arms and hands shift to a Great Dane's forelegs, and let his weight drop onto them. The male followed him down, shifting position as the teenage boy became a young female animal. This time, when the male's know relaxed enough for them to separate, Luke was fully transformed physically to a female Great Dane, and she liked it!