I made her backstory that i volunteered Buddy as part of an experiment that could create a complete way of changing gender about a year ago, so they could test it on Buddy. However it went slightly wrong and made Buddy human as well, she decided her new name would be Betty, the only problem is, that despite her now increased intelligence, she still views me as her master, and every night is horny for me, despite me turning her down most of the time. A few tweaks to the experiments formula created a finished, perfect way to change gender and was mass-produced, and because of this me and Betty have become semi-famous. Betty and I have since become a couple, I think I might propose to her in a little while. Betty is most comfortable while naked, but does wear a lot of dresses and skirts while we are out.