Houseguests/Keep going-1

From Torg Adventure

I'm in the bliss of finger fucking my wife under the blanket while her sister strokes my shaft. This could be amazing or terrible.

I decide to go all in. I maneuver my hand under the blanket to Sam's lap and rub her slit. She quietly gasps next to my ear. Her hand pauses a few seconds and then continues jerking me. I slip inside her panties and find her soaking wet slit.