Renewable food supply--I hadn't thought of that.

I've read one too many Spike/Xander fics where Xander tries to stop Spike having to kill anyone by asking if he can't just 'live' on Xander's blood alone, and Spike replying that one person just isn't enough. I've long had the thought that Jack would be a perfect vampire's pet in that respect.

Poor Jack. I have a go at everyone else for what they put him through, and then I put him through this!

I'm sure someone will rescue him soon, though :-)