Relationships are like the Western Front of WW1. It's push and tug the whole way, and you're going to have to fight for every inch of it. Only was the enemy is beaten (metaphorically) into submission.
Then you can get that sweet PG13 pash. But until then, prepare yourself and never budge an inch. War, and in this case, relationships, are hell, and you're going to need to contest every moment with her to achieve final victory and make her bear your children.
Then you sir have failed. Never, ever think of them as a good friend. They're a lover, someone to talk to, someone to love. By saying this, you have jeopardized the operation.