"Wow, you're really hot inside! I'll bet it would feel great to…" Doug's cheeks reddened a little as he thought of the unthinkable. Robyn was beginning to feel frightened. Yet, her brother's finger felt so teasingly good. She tried to push his hand away, drawing a foot back to kick at him. With her knees bent sharply like that, Doug was able to slide his finger as deep as it would go.

"Uhhh, uhhhh, ohhhhh!" Robyn gasped, her hips thrusting, her tits heaving under the flinty material of her nightie.

"Does it feel like you're getting fucked?"

"How would I know, silly?" Robyn bucked her ass, then shivered. "Stop it now, Doug. You told me you'd give me the money if…"

"Have you ever thought of going all the way with some guy?"

"No!" Robyn shook her head hard, her red curls splashing across the pillow.

"Wouldn't it feel good to fuck? God, when I think about it, it makes me a little wild inside."

Doug was thrusting his finger in and out of her cunt. Robyn could feel the tightness of her pussy closing down around him, squeezing him. Just like his finger was a tiny cock! Robyn wondered if this was close to how it would feel to let somebody fuck her. But a finger was so small and a cock was so big! She remembered all too clearly how it had felt to hold her brother's prick in her hand. Doug was finger-fucking her faster and, as he pushed into her, he let his thumb slide across her juicy clit. She couldn't hold still. Her hips lurched from side to side and she was panting wildly.

"Doug, please, Doug, stop it right now?" But Doug wasn't stopping. He was climbing up over her body. She felt him kiss her belly, pushing her nightie up to expose her tits. When she looked down, she saw his cock! It was stiff again, the head still wet with the cum he'd spurted.

"God, Robyn, wouldn't it be fun to do it?" he whispered. There was a crazy look in his eyes. Robyn tried to roll away, but he dropped his weight onto her body and pinned her arms.