Eventually Penny said, "my turn now." I did the same for her, pushing the boundaries even further. I could tell Zena was watching. She feigned adjustment of her bikini bottom and took the opportunity to briefly rub her pussy. 'gotcha' I thought. As Penny and I kissed I pushed my hand into her pants and slid a finger between her wet labia. She 'ohed' into my mouth. I was just getting into this when the back gate opened again, and Mark appeared. He pretended not to see my finger in his wife or Zena topless.

"How's it going, girls?" Without waiting for an answer, he walked past us and into...