Wife is out all day because she needed it and I told her to go get a massage etc. I'm home with the kids, loving it.

Tonight the guys have asked me to go out. Now when I tell her I'm going out, she's probably going to think I had a covert contract planned all along which I didn't because I told her to go out in the morning and the guys organised stuff a few hours later.

So - do I just tell her I'm going out tonight and fuck her hamster and her thinking I "planned" it with a convert contract all along? Or is there a better approach?