When I caught my sister tanning at the beach in that tiny bikini I propositioned her on the spot. “Hey sis, mind if I slip it in for a bit?” I asked.
“Hmm? Oh sure,” she replied sliding aside her swimsuit bottoms. “Just make sure you pull out if you see my husband coming, he’d freak out if he knew I was giving you my pussy on the side.”
“If you need to cum, do it inside me. I don’t mind if you get me pregnant, but if you pull out you’ll make a mess all over the towels and my husband might see.”