Plot summary
Dyson asks Bo to go undercover as a therapist to investigate a rash of human suicides. Bo believes at first that a Suicide Fae working at the clinic is feeding on the victims, but after that Fae dies, Dyson goes undercover as a patient and falls victim to what is happening. Bo discovers a Rakshasa in the form of a cat is responsible for the deaths. Bo being monogamous with Lauren and chi-feeding from her only is causing problems. Lauren is becoming weaker and Bo is unable to sustain herself sufficiently.
After being severely injured she is forced to feed from Dyson. Bo tells Lauren what happened and Lauren sets some ground rules: Bo can feed on others, but not Dyson. Kenzi tries to talk to the others about the rash on her arm and how it's getting worse, but no one listens and at the end of the episode is pulled into darkness by an unseen force.
Credits
Adapted from Wikipedia contributors, Lost Girl season 3. HTML formatting and reference markers removed.