In the eerie halls of their grand yet decaying mansion, siblings Mabel and Dipper, both insatiably curious, stumble upon an ancient prophecy hidden in their great-uncle's attic. As they decipher the cryptic text, their hormones rage, and they find themselves drawn to each other, unable to resist the gravitational pull of their taboo desires. Mabel's eyes widen as she watches Dipper's growing bulge, while Dipper can't help but stare at Mabel's perky breasts straining against her shirt. Their lust escalates as they read the prophecy aloud, its words igniting their forbidden passion.