In the quaint town of Gravity Falls, high schoolers Wendy Corduroy and her cousin Dipper have always been close, but their feelings run deeper than family. Wendy, the mature and alluring redhead, finds herself drawn to Dipper's intellect and charm, while he can't resist her curvaceous form. When a school assignment prompts Wendy to write a frank note about her desires, she can't help but fill it with steamy fantasies about her cousin. Little does she know, Dipper intercepts the note, leading to a heated confrontation that spills over into a passionate, taboo encounter.