I don’t mean to be negative, but I am annoyed at what you said esac, she sounds nasty, even if she is being open.
She took hold of your cock after sex and said that? Thats just evil, seems like she didn’t enjoy the sex and then realised she had to do something about it and told you some bull**** about changing her mind and not wanting sex before marriage. She has had 4 bigger guys than you before, and you accept that?
Good luck on your gains though. Maybe you can please her with a bigger dick if it matters to her that much. Take care man.
Time is valuable and so is a suitable penis, so use it wisely (your penis that is.)