best_enemies is having an anonymous Master/Doctor porn battle thing, and I just stumbled up on
THIS, which is Yana/Thirteenth Doctor, with the prompt of "mortality." *flails* Beautifully done, whoever you are, and damn, I wish it wasn't anonymous, because I would fangirl you so MUCH.
(Maybe whoever wrote it should be GLAD I don't know who they are. Not a crazy stalker, I promise, but people who write fantastic Yana make me happy.)