Fenris Recruited

Acquisition

 * Starts on completion of the Bait and Switch secondary quest if you choose to enlist Fenris.

Walkthrough
Visit Fenris's Mansion (previously Danarious's Manor) and speak with the elf to complete the quest. Ideally, you should do this immediately after the conclusion of Bait and Switch, which leaves you standing right outside his front door. This conversation provides the first opportunity to establish a sexual relationship with Fenris through flirting or to stop any romance from happening.