I mean especially standing next to her. Cause the top is still a bit roomy for my tits even if it’s 2 years old because my boobs had barely grown in...all that time. But she wasn’t there for that, for just hanging out I mean. She kissed me and we hugged and she said ‘Oh. Honey you are too cute! And it’s so nice to see you too – especially outside of the office.’ Which made us both laugh cause it wasn’t like work was so hard or anything but it was definitely different than just meeting by my pool.. My ballsrose within the tightening pouch of my rising scrotum.As she continued to tongue-fuck my mouth, she gave my balls another,more insistent, squeeze. She felt my burgeoning erection. Withdrawingher lips from mine, she said, "I am your sister, brother Beau, but apart of you--or parts of you, I should say--don't seem to mind. They'reready, willing, and able enough to accept my invitation." You're my sister," I reminded her. Those words, which should have beensufficient to damper her desire. My bedroom window over looked the back yard. Harv and Mable occupied the hot tub and were splashing each other. I turned off the lights in my room to avoid their seeing me. The couple was naked and laughing when splashed. Mable's body was on the chubby side, and her tits showed the affects of gravity. It brought to mind a movie where a nude Kathy Bates settled into a hot tub with Jack Nicholson. Harv had a hard body from years of work. Mable pushed him back against the side of the tub and he. " They both looked at me kind cross-eyed, trying to make some kind of sense out of what they just heard their mother explain to them. I could only laugh and smile: "Google it! You'll see!" And that was it. Off they went, leaving me with my half-finished glass of merlot, wondering if I was doing the right thing for them. I recalled my own coming of age experiences: strict religious upbringing with never a peep from my mother about the birds and the bees. I was aware of my own blossoming sex.