Dr. Smith's relationship with the alien gradually changed from a specimen to be examined to a subject to be studied to one of almost colleagues. David wouldn't say he was exactly friends with the creature he dubbed Roz from the con-men's claim of her origin but they did have some sort of connection as the years progressed. Roz was kept in isolation in a plexiglas chamber at the back of the lab but she was gradually given more time out of there until she had free reign of the lab and only returned to the back to be locked in when he left the lab for the night.
Advancements in technology led to the development of quasi-language capabilities for Roz and she learned to communicate with David. The equivalent of a toddler's babbling in the beginning progressed until they could hold actual conversations about abstract concepts.
Roz could convey very little information about her home, "I was an immature being when I was taken. I have no memory of any existence beyond this." She had no idea of what she was, just "I am not like you or any sentient creature I have encountered."
David broached the subject of reproduction but once again, Roz could give no information.
"This is a concept I am not familiar with. I do not seem to be a sexual being in any of the ways I have studied thus far. Perhaps it is instinctual with my kind and I will know what is necessary when conditions are right and I have matured sufficiently."
David arrived at the office one morning, turned to greet Roz and stood there stunned, his mouth agape.
No longer an asexual entity, Roz had been transformed. Her features were no longer alien; instead they blended into the form of a beautiful human woman. Roz had been metamorphosed into the epitome of his perfect woman, the woman of his dreams, his fantasies.
She beckoned him into her sleeping chamber and said in a low sultry voice, "David, I can now answer your questions about my reproductive system. Even better, I can show you."
As David joined Roz on the bed his last coherent thought was "You were wrong all those years ago, Tommy. She does have boobies and they're perfect."