So. Couple of things:
1) King Calenhad drank dragon blood to become a Reaver and some of that power was passed down through the generations, to the point where Arishok!Sten tells King!Alistair that he has the blood of dragons in his veins. (Also Sten calls Alistair kadan and that's not important I'm just still squealing about it.)
2) Vashoth have enhanced senses, particularly enhanced senses of smell, which dovetails nicely with 3.
3) The Iron Bull really wants to fuck dragons. This is not news, of course, but seriously in the game if you become a Reaver and are in a relationship with him, he straight up goes all googly-eyed horny for you because you drank dragon blood and smell like a dragon.
In light of these facts, I think it's only logical that if Bull is with you for In Hushed Whispers then he would definitely be DTF on sight with King Alistair who marches his ass into Redcliffe to chew out the mages for Doing A Stupid with Tevinter, smelling like goddamn dragon blood. I'm just saying. We were robbed of the Iron Bull very publically getting scent-drunk and making a pass at the King of fucking Ferelden.
