Well, honestly, if I'm being ultra anal, there are four pairings to consider:
Gwen and good Pete,
Gwen and bad Pete
Gwen and Red and Blue Spidey,
Gwen and Black Spidey.
Gwen will make the first move on Red/Blue Spidey, then EMO pete will make a move back. Black Spidey is the one who gets all the sex and good pete is stuck with the dinner bills and all the emotional heartbreak from MJ