Now that's an indecent proposal. "I see you checking out my wife...starting at her firm tits and tight ass, wondering what it would be like to shove your dick in that sweet pussy! So I've got a deal for you. Since I go both ways, you gotta fuck my tight ass first! She'll do whatever you want, but before that, you've got to fuck me 'till I can't cum anymore! OK? Cool, I'll get the lube."