“Blacktop Highway” prefers butterscotch, spooned and drizzled in the midst of a sexual frenzy.

Directed by Randee Trabitz, it’s a show that embraces absurdity from the get-go but eases us into a creepy story line full of cruelty, lust and shame, about a pair of incestuous siblings, their Bible-quoting father and a menagerie of animals in constant danger of being killed for food or taxidermy. There are also a disfigured, rather yearning character, called Pitiful Creature, and a fusty academic who breaks in occasionally to comment on the work. All of them would do well to watch their backs.

Aided by a bit of puppetry (designed by Christine Papalexis) and extensive video (designed by Heather Fipps), both prerecorded and live, the charismatic Mr. Fleck plays each character as well as the narrator, and does sound effects. As technical elements pile on, the show becomes messier than it needs to. A technical glitch on Saturday night foiled the ending.

Some of the evening’s funniest moments occur onscreen. Yet “Blacktop Highway” is at its intoxicating best when it’s simplest, depending on little more than Mr. Fleck’s rapid-fire ingenuity as a live performer. In the room with him, our imaginations can fill in the blanks.