In "Full Anal Service #4," racy young models requiring back end attention bring their asses to rectal master mechanic Mike Adriano for rear chassis overhaul. Perverse maneuvers with toys and Mike's enormous tool stretch, explore and tune up the finest, most insatiable butts on the street. First is a threesome starring gorgeous Riley Nixon, whose hair is cropped super-short, and her cute girlfriend, Avery Adair. Mike sodomizes Riley and Avery gags on his prick ass-to-mouth; the nasty girls orally swap semen. Thick, lovely Ariel Blue tongue-cleans the director's bunghole. He gives Ariel's pale, phat booty a reaming to remember. Petite, cute Alana Summers stands only five feet tall; Mike fucks her face and thoroughly shafts her little, round derriere. Pale, natural Anna de Ville loves getting her asshole bored out! She performs some breathtaking anal winking and enthusiastically takes Mike's dipstick in her rear crankcase. He wrecks her sphincter with some intense speculum action.