She has a lovely, suckable clitoris - looked so nice with the hood pushed back.
She is lacking confidence, but she did meet you, and it progressed to panties off and on-going sex, so if she can find a guy she feels comfortable with, he will be very pleased at the opportunity to have sex with such an attractive woman.
It could be a friend or a complete stranger in another town where she will not be known, but she is likely to truly enjoy herself if you don't push her faster than "she becomes ready in her mind".
A women needs to dream and fantasize quite a bit about being with a new guy, as it is a big emotional leap forward to share her body with two men. And you need to give her the space to grow this new relationship according to the speed it needs.
You are asking her to be "kinda married" to two guys, each with different needs, so you must not interfere with any attachment she makes to the other guy.
One night stands are not very satisfying, it is better if she forms a deep connection to a guy initally, so she can become familiar with the enjoyment awaiting her. After 6-12 months of extra-marital pleasures, she will find her feet and choose her lovers herself as her confidence goes through the roof.
It can be a bit scary for some husbands when they realise that other men get very turned on by the thought of having sex with a married woman who is keen to try fresh cock.
Extra cock can make a married woman bloom like a beautiful rose, because of all the extra attention she is receiving.
I wish you both the best of luck, and hope you find suitable men to share your bed on numerous occasions.
What a great figure she's got - why is she worried?