I F/ 18 Confess I have never sucked a guy

My wife & I are really open with each other about our wants and needs. I know she would do damn near "anyhing" I want her to including doing me. We even webcammed online once. We both are ready for more. But what? I'm up for "anyhing" she wants. I want it all. Or nearly! How do I go forward? My wife loves me & is adventuresome but how far will she go? Suggestions welcome. HELL I'M BEGGING HERE!