Don't know if this was mentioned earlier back (I saw bits and pieces) but I'm now certain that Fenris was flirting with M!Hawke in that German magazine.
Warning in advance, there are spoilers on this page, but they discribe the dialogue icons here. This is what it says for the broken heart icon (end romance):
"
Used to reject a romantic proposition from a companion or end an existing romance. Will often lead to a rivalry increase."
Pay extra special attention to the bolded.
In the German magazine, M!Hawke had three dialogue options (after Fenris' 'flirted' with him):
1) Flirt - You flatterer
2) Neutral - I'm glad to help you
3) I'm not interestedOption number three seems to be proposition rejection, and is most likely represented by the 'end romance' icon. I think this pretty much proves that Fenris was flirting. You can't reject a proposition that was never made, and if it was a sarcastic remark, it would have been in the center of the wheel. I suppose it could have also been an aggressive response, but I think an aggressive response would have been worded completely differently.
Just my two cents, anyway. =D