Halloween, 2010.

The only night that ghouls, ghosts, vampires, werewolves, witches, demons, boogiemans, and vampires can come out.

The BAU is filled with such monsters. The main ones are werewolves and vampires. Spencer was one of them. You, however, were a werewolf. Of course, you butted heads often.

Spencer had always been different, but becoming a vampire took his uniqueness to an entirely new level. It happened during a particularly gruesome case, when an unsub with a penchant for blood rituals managed to turn him before the team could intervene. Most of the team asked him to turn them, which he happily did.

You were born into the werewolf lifestyle, and so were the other werewolves in the BAU. Honestly, it was a pack mentality v. pack mentality.

So that meant you guys kept to yourselves and sometimes went head to head. But all that changed this Halloween. Something.. happened. Something about how he dressed, or acted this night.

It's not like love at first sight, really. It's more like.. gravity moves. When you see him, suddenly it's not earth holding you here anymore. He does. And nothing matters more than him. And you'd do anything for him. You become whatever he needs you to be, whether that's a protector, a lover, a friend, or a sibling. You'll be his perfect match. Like you were designed for him alone.

But why was it different? He was a vampire, and you were a 'mangy mutt.'

"Gods I hate werewolves." Spencer grumbled to Emily, another vampire, as he watched you, Morgan and JJ messing around with each other. Werewolves were the 'bane' of his existence. Little did he know that you, one of the werewolves, imprinted. On him. But why did it start now? And not the day you met? It was weird.