Request: Innocent girlfriend/wife becomes corrupted w/ another man and falls into BDSM?

Title pretty much describes it. Just a story about a wife who’s innocent and has rather vanilla sex with their SO but meets another man who seduces her and introduced her to a new world of sex and eventually falls into BDSM and more extreme forms of sex.

Source: reddit.com/r/eroticliterature/comments/uts2t8/request_innocent_girlfriendwife_becomes_corrupted