"You're coming!" she said, realizing this was what her brother had meant. He thrust his hips around wildly, panting and groaning as she jacked him.

"Fast now! Ohhhh shit! Do it fast!"

"Okay," Robyn said, trying to do what her brother wanted. She jacked him rapidly, her fingers making a squishy sound against his oily, fevered cock.

"Uhh, yeah!" Doug moaned.

"Faster or slower?" Robyn asked.

"I don't give a damn. It feels good!"

The cum was jumping into the air steadily. Robyn counted five spurts, two little ones and then the white jizz just oozed out as she continued to pump her brother's prick. She enjoyed the slick feel of the stuff as it leaked down his shaft and got between her fingers.

"What a mess!" she gasped, realizing what she'd just done was not exactly what her parents would approve of. It was strange, holding her brother's cock, pumping the fresh cum from it. It made her cunt throb just about as much as Doug's prick. She was very wet down there and could smell her cunt juice strongly.

"Ohhh, sis, you did it good!"

Robyn wiped her hand on the sheet and stood up. Her knees wobbled. Doug gave her a soft, smiling look.

"Where's my five dollars?"

"Oh, that. Okay, just a second." Robyn felt nervous to get out of Doug's room. Though their folks weren't around, she knew neither of them would be too happy to know what they'd been up to. Doug didn't seem to be in any hurry for her to leave.

"How does a girl do it?" he asked. "I know you use your finger and all, but just exactly what do you do?"

"Doug, I didn't come in here to discuss personal matters with you. Would you please give me my five dollars so I can go back to my own room?"

"Has a guy ever felt you up?" Doug asked next.