Note: Written for the prompt "dream" at dw100. In the novel Fear of the Dark, it's mentioned that Tegan had "nightmares, often featuring snakes" after leaving the TARDIS. I wanted to do something with that. Spoilers for Kinda.
Snakes.
Tegan tossed and turned in her sleep. It was going to be another one of those nights. Her dreams seemed to always go back to them. Back to a garden on a planet called Deva Loka, back to those thoughts of pure hatred and rage, back to another version of herself and a mark on her arm. It had been several months since she stopped traveling with the Doctor and Nyssa. The Doctor had destroyed the Mara with just a mirror, hadn't he? Why was she still having these dreams? Was there truly no way for her to escape this monster?