Fenris is well prepared with a quipped response to that, but Kirk kisses him and takes the words with him. He moves forward to return that kiss. Fenris is not known for his gentleness- it doesn't come easy to him. As such, his kiss is much like he is, fierce and challenging. A little much, perhaps, but he has wanted this for some time.

A part of him knows he could well be seeking disaster in this, but he doesn't care. He didn't get where he is today by baulking when a chance came his way. He's learned to take whatever he's offered with both hands. You never know when it may be gone. When you run out of chances.

And so, he kisses without regret, returning it with ferocity. If this is going to be a disaster, he might as well enjoy it while it lasts.