First off for the opening, it seemed sketchy at best from the description, remember to be the AMOG. Remember to be willing to lose her to win her. Confidence is key.
As for the rest it seemed ok, but you could have used some seduction patterns and sped up the process, but it seems getting sick was more of the enemy in my eyes. I believe there is a 7 hour rule or similar before you can sleep with a woman, so you seemed about on the right track.
To keeping her around, you can do that, but you will need to read up on some NLP and use a Swish pattern or something similar to help convince her that you can be a priority over her sorority. After this swish pattern you should run a Pleasure pattern and then anchor it to yourself, so that when she thinks of sorority, she finds you are a priority, causing her to think of you which elicits the pleasure.
Happy sarging.