Perfectly Marlene and Severus

Marlene doesn't know why she didn't just go up to the girls' dormitory instead of playing truth or dare in the common room. But when Severus Snape joins her plan to get back at the scheming Sirius Black and his friends will their relationship bloom into something more? Or will it all just be some big joke in the end? Slight mentions of Jily, and WolfStar in this story.