Is it normal to share my wife??

I recently began fantacising about fucking my wife in public, the it started to evolve to get into wanting to be watched..
i started to talk about it while we are having sex. At first she said she wasn't comfortable, but she was getting really wet everytime. later on she started asking me to talk about more and even she started talking about having another girl with us..anyway that was all happening while having sex only... the thing is that i'm now starting to fantasize about having another cock in her pusy and i even said that to her, she responded by saying that she didn't like it , and that it makes her feel uncomfortable but se was really going wheni talk about it.. now, and as u cn see when i ask her while having sex to do what makes me really horny, she just gets down on and starts sucking my dick while asking me to finger her pussy pretending to be another dick.. i really get hard thinking about it and she is not saying anything about it but i don't know if i would like this to happen in reall... and i'm afriad that someday i would go far with this.. what do you think out there,, any help here plz???