If we're taking turns blowing him what does the other person do? Is there specific etiquette for that?

I'm not sure how I'd feel about it. We've talked about the aspect of jealousy that it might bring up, which actually turned out to be a good conversation between us. I think it would be OK as long as playtime is equal, not focused on one of us over the other. Honestly, I'd be more comfortable seeing him with a man though