Three Flavors Snack

Dave and his flatmate are aficionados of crisps. They munch on them relentlessly. In a quirky turn of events, a chip lodges itself at the bottom of the pack and grips on tightly, resulting in their futile attempts to dislodge it.
Turning to stepmom for help, unbeknownst to them, she harbors salacious intentions far beyond simple assistance.