How does one approach bwc anons for them to titfuck my wife, nothing more?

Just tell her up front, if she likes you she won't give a fuck. She'll even join you and tank all your ranked stats but occasionally play comfy old school snes through the night with you.
I told her on our 1st date, she said she did too and told me she played some gay ass shit like harvest moon and animal crossing but it was a start.