this is really random, and most likely unintentional but vaughn oliver is a famous graphic designer so your name field totally made my day.
i didn't have anything too specific in mind just a bunch of different ideas. have you seen the first generation of skins? i was thinking kind of the dynamic during season one. he's not necessarily a jackass but just not emotionally available for the most part. they wouldn't have to be a couple, just someone she'd get drunk and sleep with on a semi-regular basis. they could have colossal fights either because she get jealous watching him make out with other girls or he hates how much time she spends with her best friend cheswell. he could have a horrendously embarrassing nickname for her she would claim to hate (ie. nips, areola). they could get high at her house, go skinny dipping in her pool and raid her parent's liquor cabinet. if none of those sound good, i'm sure we could work up something. basically he'd just be the guy she's just nuts over despite the fact it's not the healthiest relationship for either of them.