Oh, but it is WOW! I've often had gangbang fantasies. I've been lucky enough to participate in a few, from both ends... if you'll kindly pardong the pun. I like your version of it, especially the bit where your Dominant is in the room to assure your safety.

And perhaps the best part... it could easily happen with the proper influences. All one needs is a good Dominant, a few discreet participants, and plenty of latex.