Haha, that printer pretext was golden! Goes to show that guys and girls alike will know what's going on... pretext is as good as any.
Well she didn't give it up. I know it's irritating like hell, but happens to me alot. Some posters will suggest that you didn't turn her on enough but that's bullsh1t, or at least I wouldn't know how, if you were already dry-humping with her breathing heavily.
Girls will just have a very firm plan to make you wait. This is not about passion, it's about control. What works for me is to accept it the first time (but still give her a great time making out and all), maybe also 2nd time, but then become distant. Don't have to go ghost, but definitely pull back. If she is interested at ALL, she will pursue, and if you play this right she will really want to have sex soon because she's just not sure if she can keep you.