The cougar's eyes narrowed as she heard the door creak open. She was sprawled on the bed, her BBW form clad in a silky robe that did little to hide her generous curves. Her step-son froze, taking in the scene - her thick thighs parted, revealing the wet, pink slit between them. She'd been touching herself, her fingers glistening with her juices. "It's okay, baby," she purred, "Mommy just needed a little... relief. But now that you're here, maybe we can find a better way to... relieve each other."