Secret Affair With The Wife’s Friends Daughter

I'm Nick and spent the first thirty odd years of my life in Camberley, South West London, currently 55 years young, very happily married and live in Thailand. The wife basically let's me do what I want and visa versa, but for whatever reason, she's not interested in sex, so end of that story. However, I'm the complete opposite, and over the last twenty years or so, had hundreds of short term encounters and several long term relationships.
Anyway, the daughter of the wife's friend is a sexy little thing, her name is Lin, 26 but looks 18, highly educated with a masters degree. But because her parents are quite wealthy, she's never worked and two years ago, got married to a similar aged guy who's an officer in the Thai Army. Apparently, it was an arranged marriage as that still goes on out here, and all about having a big face and status.
So it turns out, surprise surprise, that she's not happy, and the whole marriage is all about the parents having a big face and a sham. However, she is also fascinated by ladyboys, so the last two chapters are about what happened when I took her to Bangkok and arranged a foursome with two transgenders.