Thinking of confessing to wife my love for t-girls

I have been considering for a while now about telling my wife of 2*****s that I really desire to have sex with a transwoman, particularly performing fellatio on her. I have hidden this from her for years, but I yearn to have my sexuality out in the open with her. I know using porn and actually performing the behavior are completely different, but I have actually done it behind her back and really enjoy it. I feel terrible about it, but she does not have a penis to play with, so she can't help me with this.

Of course I am willing to let her experience sex with another man or woman if she desires. I realize this may hurt her, which I don't want to do, but I am not being true to myself either.

Has anybody confessed something like this to their spouse? How did it go? Any advice on how to do it? Any and all opinions welcome.