December meme: Haven, Duke and Nathan edition

I shifted the Dec 14 question forward a few days, since I did two posts on Saturday, and then I forgot to answer Sunday's. Whoops! So this one is for December 15.

justhuman asked: Tell me about Duke and Nathan and the fanservice that's gushing out of Haven

Oh, man, I'm not even sure I can be coherent about this. ( This season has been a Duke/Nathan slasher's dream )

---

Full request list here, still open!