Exactly what it says in the title. The Assassins and Templars are all werewolves, hence their desire to be in groups (packs)and the constant fighting to defend their territory.
At some point after their first meeting Haytham stumbles across a badly injured Conner, who for some reason (sickness, exhaustion, etc) is not holding his own against his attacker/s. Now, so far, their relationship has been as in the game (strained, passive aggressive to outright hostile, full of insults, putdowns, and snark); however, seeing Conner in danger hits Haytham right in the instincts/true feelings. That is his baby/puppy and someone is going to die. Cue Papa-Wolf Haytham annihilating Conner's attacker/s, bundling up the injured Assassin, and taking him off to a safe place so that he can be mothered (er, fathered) back to full health.
Bonus points: +100 for wolf ears and tails on everybody, which - when one is not seriously controlling their emotions - give away what one is really thinking/feeling +500 for howling at the moon, and Connor being young enough that he still has a squeaky-puppy-howl. Haytham absolutely does not consider this the single most adorable thing he has ever experience, and does not want to cuddle the living daylights out of Connor when it happens. No sir, not at all +1000 for sleepy/injured-puppy-Connor being extremely cuddly, and papa-wolf Haytham taking advantage of it +10000 for Connor, who was not raised by other werewolves, being somewhat clueless on how a werewolf is really supposed to act; Haytham has to step in an educate him, like a real daddy (and "ha" Achilles, who's an awesome father-figure now) +Internet if this is an A/B/O world, and papa-wolf-alpha Haytham is constantly on guard against/intercepting the numerous alphas who are drawn to clueless-omega-Connor
Werewolf AU - Haytham is the ultimate papa-wolf
At some point after their first meeting Haytham stumbles across a badly injured Conner, who for some reason (sickness, exhaustion, etc) is not holding his own against his attacker/s. Now, so far, their relationship has been as in the game (strained, passive aggressive to outright hostile, full of insults, putdowns, and snark); however, seeing Conner in danger hits Haytham right in the instincts/true feelings. That is his baby/puppy and someone is going to die. Cue Papa-Wolf Haytham annihilating Conner's attacker/s, bundling up the injured Assassin, and taking him off to a safe place so that he can be mothered (er, fathered) back to full health.
Bonus points:
+100 for wolf ears and tails on everybody, which - when one is not seriously controlling their emotions - give away what one is really thinking/feeling
+500 for howling at the moon, and Connor being young enough that he still has a squeaky-puppy-howl. Haytham absolutely does not consider this the single most adorable thing he has ever experience, and does not want to cuddle the living daylights out of Connor when it happens. No sir, not at all
+1000 for sleepy/injured-puppy-Connor being extremely cuddly, and papa-wolf Haytham taking advantage of it
+10000 for Connor, who was not raised by other werewolves, being somewhat clueless on how a werewolf is really supposed to act; Haytham has to step in an educate him, like a real daddy (and "ha" Achilles, who's an awesome father-figure now)
+Internet if this is an A/B/O world, and papa-wolf-alpha Haytham is constantly on guard against/intercepting the numerous alphas who are drawn to clueless-omega-Connor