Mischievous step-sisters transform into provocative extraterrestrial beings and entice their nerdy astronomy step-brother in a steamy encounter involving all three siblings.

Mischievous step-sis and her friend, both voluptuous brunettes, tease their astronomy-nerd step-brother, transforming into provocative aliens, revealing their ample assets and hairy treasures. A steamy FFM encounter ensues, featuring a dominant beaver and a monster of a climax.