I'd really like a fill focusing on them trying to deal with the fact that they have an incestuous, hugely taboo relationship. They meet and become closer as they work together and spend time together, but that is not the closeness between father and son and they both know it. Huge amounts of guilty, shameful ust where both are trying to ignore their growing desire but it doesn't really work, lots of long, meaningful looks and even longer, lingering touches that look innocent to outsiders but drive both of them crazy, crowding each other's personal space until the tension between them is so thick one could cut it with a knife, almost kisses, etc.etc. What they want is inappropriate, bad, wrong and could land them both into a huge amount of trouble should they act on it and if someone found out - even their own allies - but they can't help the way they feel. Finally something happens and one of them snaps (preferably Connor, but it's ultimately up to potential fill anon) and jumps the other - rough, desperate sex ensues. Bonus points for:

-Should Connor be the one to press the issue Haytham is terribly reluctant but eventually really gets into it and fucks Connor till the latter screams

-Potential daddykink

-After the sex Connor curls up in Haytham's embrace and falls asleep and Haytham actually feeling guilty for a change, feeling that was one line he shouldn't have crossed and actually feeling like he failed Connor, but at the same time feeling unexpected amount of tenderness as he watches him sleep

-In the morning Connor wakes up and he's actually happy and Haytham decides that's a line he'd be crossing again. And plenty of times. :D

-Morning after round two but with slow, sleepy, tender sex this time around.