Here's what I do. Plenty of chicks are the insecure quiet type. All you need to do is create a bit of intrigue, be just aggressive enough, then dump her after a couple weeks. If you picked the right type, 80% of the time she'll be yours to take whenever she's available again, due to her baggage that you created. In the meantime, you'll be free to fuck whoever else you want. Another protip: they all become 5x easier the week before leaving for vacation, and 10x easier if she's plastered. She won't care if she's physically uncomfortable about fucking you, if her emotional baggage wants to be validated by your dick.