Of course it's my fantasy. But after a few months I would tell her that her insane growth is cause by roids I feed her for 3 months, then she would decide to take it more and I really wouldn't mind is she turns into something like transgender muscle monster. I would support her and give her orgasms every day when she works out for me. 
Sorry about resurrecting an extinct thread but I kinda want to weigh in here.
As a fantasy, yes, of course it is OK... all fantasies are, otherwise we're approaching the area of thought crime.
However, that's not really the way you first presented it. What you actually
said was
"Sometime I imagine what would I do if I had fbb wife." I'm not saying that I know what you
mean but from the way that you
worded it, it seems like, yes, it's a fantasy, but it's a fantasy because you
don't have a bodybuilding wife, not because you necessarily feel that you shouldn't do it if you did.
Like I said, maybe you didn't mean it the way it sounded and as a fantasy, yeah, sure I like it. Would I do it IRL, though? No, absolutely not... it would violate the trust, it's a dick move, my SO would likely notice and kill me on the spot and that would be the end of the relationship. The absolute
biggest reason I wouldn't do it, though, is that, as much as I love the idea of her getting more muscular even faster, I actually love
her more than I love her muscles so I wouldn't want to do anything to hurt her... not even when it's something that I would really,
really want for myself.
