"You're not going to believe this" she started. Then she told her exactly what Arnold had told her last night. Monica was aghast. This was not possible. "You are lying to me" she insisted. Jackie know that the only way she could make her sister believe was to show her. She sat on a low stool, and carefully took her panties off. Monica came close and realized that her sister was not telling lies. She reached out her hand. "May I touch?" she asked. Before Jackie could reply, she had taken hold of the penis with both hands, and was skillfully bringing it to an erection. As quickly as she had grasped it, she brought her mouth to the end and started to give an experienced blow job. Jackie could not believe the sensations exploding through her. She wanted her sister to stop, but she didn't. Jackie was also curious to know what would happen. She quickly came, but this didn't stop Monica. Pulling down her own knickers, she was astride Jackie on the stool, and bouncing up and down, quickly brought both of them to an orgasm.
When they had both calmed down, they cuddled each other as sisters and started to clear up. This was an incident never to be repeated, never to be spoken about, never to be thought about. They made lunch and started to talk about other things.