So I'm not entirely sure where my mind went, but I'm pretty interested in seeing a Peter/Allison pairing. Either a darker version where Peter manipulates Allison, or a fluffier one, had Allison lived, became more of a badass and met Peter years down the line. Maybe hunting him because she thinks he's at fault killing people? Tracks him down for information on a rare creature? Meets him again at Stiles and Derek's wedding? Who cares I'm here for it all.
And they realise they have a lot more in common than they thought. They’ve both lost people, they’ve both had their lives ruined. And Allison, who knows exactly what it feels like to lose control and want revenge, understands what Peter went through when he woke from the coma. So what starts as grudging respect becomes actual friendship and trust, and then suddenly they’re in a relationship.
Peter loves her, but it also helps that it pisses Chris Argent and Scott off so much!