I've experienced a number of "get togethers" with two to three other men and my role was simply to suck all of their cock's. I would wear a black corset, garter belt, and black stockings as I pranced around the room going from cock to cock. The outfit made me feel so feminine and submissive towards their needs. They all seemed to enjoy me dressing this way too as they used my mouth for their sexual pleasures. Psychologically I think dressing that way for them helped them to accept a guy sucking their cocks as they called me their "sissy-boy" which helped me to be so submissive towards them during those gatherings.
I should add that my submissive role required that I accept multiple facials as those guys really enjoy shooting, they're cum loads all over my face when dressed up that way.