After facing off against the Ouroboros, Starkey gets sick and Darius takes care of him. Slight spoilers for episode 11 Ouroboros. Diverges from canon at the very end of the episode. Slash/MxM Romance. Darius/Starkey.
When The Doctor is pulled into the STM, and comes face to face with K9, he wonders if this could in fact be one of his. When he finds out the truth, he tries to help regain K9's memories but The Department has other plans. A/N: Set during The Power Of Three in Whoniverse and anywhere in the K9 universe.