Novels DA2 work a little different from that of Dragon Age Origins. For a love story begins to flirt with him Fenris early in the game and not flirt with someone else! You can make a rival romance or friendship (I choose friendship). In addition to flirt, be sure to pick up their gifts in Acts 2 and 3, Shart Book and the sword of mercy. For a more detailed explanation, go to Dragon Age Wiki.
Bioware really showed us girls here. Fenris romance seemed natural, and passionate, and every girl loves a bad boy;) I do not know what they were thinking, Anders ... You do not flirt with him twice and then he confessed his love and move in real estate. Although the ratio of Fenris accumulates. It starts a flirtatious friendship, but by the end of Act 2 shows for you. This elf has some serious baggage, and I think that's why it seemed so real. Is he sick, angry and confused, and the last thing he expects is to fall in love - you.
Another thing I liked about romance Fenrir was the banter of the party. Merrill made a comment about Fenrir being in love and show the puppy eyes, Fenrir and Donald argue with you, and Isabel has some choice words for you on Fenrir.
I really, really liked this game and I was very impressed by the ability to BioWare's novels. Although Thane Mass Effect 2 is quite boring ... Anyway, five stars for Fenrir!