Breathe // Doctor Who Fanfic

Travelling with The Doctor was never exactly the safest of activities; it's not just as simple as returning home after a day's work when you're done, definitely not for Cassie Byrnes. Travelling can have some dangerous, fatal side effects on some, especially those with already weakened bodies, which Cassie found out the hard way. But when The Doctor's enemies follow her home, she's going to have to be prepared to do an awful lot of running - something which is a lot more difficult for her than it would be for an average person...