Actually, Sabin and Gwen is my favorite pair in all of the Lords of the Underworld series. Why? it's because they're perfect together. I love how Gwen came out of her shell. I mean, she's a harpy so she really has another personality, but the fact that she let Sabin take care of her is just so sweet. I also love it that Gwen is meek and then suddenly shifts into possessive mode when it comes to Sabin. Sabin on the other hand, is a real sweetheart.. so sexy and a bit of a he-man. If i was Gwen, i won't let go of him for even one second..i don't even need to be a harpy! ha! 
 I love the title btw because it certainly fits Sabin's demon. =)