Massage her pussy through her pants?

[Chance Too Burn]

So every time we get a lunch break at work or we get off early me and my girlfriend (who works at the same place with the exact same hours) we go somewhere else and either talk / make out. Now when we make out she wants me to massage her pussy through her pants. Problem is, were at a college the entire time. No clothes are going to come off whatsoever. How do I massage her pussy through her pants and make her feel good? If there's a video post that too.