She moves her head to your lap

Megan urges me silently with her hands to recline some more. I do what her hands are asking me to. Now in this position Meg is able to lie her head down on my lower stomach right above the top of the blanket. As quietly and slyly as she is able Megan raises the blanket up exposing the head of my hard cock to her waiting mouth.

Megan snakes out her tongue gliding it around the head of my cock and lapping up the precum that has already formed at the tip. Ever so slowly Megan moves her head closer to my cock trying to keep her actions from Sam's awareness. First Megan's lips make contact with my head, as they do she gives me a little kiss, before inching forward again and taking the first inch or so of my cock into her mouth.

She continued this way for another few minutes. Almost imperceptibly moving her mouth down over my cock all in near total silence. Meg now has about 3 or 4 inches of my cock in her mouth. The pace of this and the fact it's happening while I am sitting right next to her sister is driving me wild. I glance over at Sam to see if she's noticed any if this.