Ever since Sami had come out as a trans woman, she had lost friends and family, none of whom accepted that the macho, muscular guy they knew was actually a woman. She was just barely hanging on at her job, where she had been shunted into a back room position with little contact with the public or co-workers, and the area in which she lived was thin on other trans people to hang out with. And for a tall, broad-shouldered, non-passing trans woman such as herself, romance was only a fantasy. Through it all, there had been one social constant, one to whom she could always turn for love and support. Her dog, a pound mutt, Rex.
"Here, boy" called Sami. Rex trotted in, as enthusiastic to see Sami as ever. I wish, Sami thought, that Rex become my loving, sexy, kind, intelligent, gainfully employed boyfriend.
Rex began to change immediately. His brown hair turned to brown skin, his muzzle withdrew into a flat, human face. His limbs thickened as his body reshaped itself into a bipedal one. His tail disappeared as his haunches became full, rounded human buttocks. His claws withdrew and reshaped themselves into finger and toenails, as his pads became human hands and feet.
Rex was human, naked, and clearly very, very glad to see Sami. "I took the day off dear" he said sounding as natural as if he had been speaking human-talk all his life. "I thought we could make love, and then I'll fix you breakfast." He got into the bed beside his beautiful girlfriend and began to caress her breasts. Sami couldn't believe how good it felt. If this is a dream, she thought, I don't want it ever to end.