No, it wasn’t her back that was extending, well not really, she looked round and saw that she now had grown a tail, and was just like the rest of the lizards. There was now no great difference between any of them. Some slight variation in body pattern, and perhaps the shape of her face, but even that was becoming more like a lizard.
But to an outsider they would all look the same. Beth, if her mind had not been altered to forget Sue, now Susie, would not have been able to pick her out.
She began to feel hungry and wondered when their next meal of insects would be released. Her tongue was flicking out of her mouth and getting longer in anticipation.
She felt safe and at ease with her nude friends here, being all female lizards. There were no males to hassle them. Unfortunately, she didn’t know much about her friends.
They were parthenogenetic, so did not need males to produce offspring. While they were lying skin-to-skin and lapping up her juices they were assessing her as to how suitable she would be in participating in their female-female courtship and "mating" (pseudo-copulation) rituals to enhance their ovulation.
She dozed off with the warmth and vibration of the terrarium; she was suddenly aroused in more than one way by finding herself now lying on her back with the lizard who had shed its skin laying over her, gently and also genitally massaging her, with the others moving their bodies against her, and licking her nipples which by now were quite aroused as were various other parts of her body.