If she is a real thai girl, you don't have to tell her anything about cuckolding. It comes natural.
My wife was already a whore when I met her. I thought she would be happy to stop it when she come live with me. But only after a few months she had met some other thai girls and she asked me if she could do some escort so she could send some moneey to thailand. I thought she would get bored quickly and agreed. Also because I thought it was cool to have my own whore for some time. But she didn't stop and went from escort to massage and then behind the windows working for a pimp.
She would tell me all the details and let me have her passy as the last one of the day. She never heard about cuckolding, but she easily turned me into one.