Our afternoon in the sun continues.
The three of us lay in the sun for quite some time, soaking up the early summer warmth. I was dozing, almost asleep, when I felt a really cold sensation on the back of my leg. Startled, I popped my head up in a daze to see what was happening. It was Shannin and she was behind me. She said that it looked like I was burning and needed some lotion. I let out a big sigh and relaxed as she rubbed the lotion into my legs and feet. Her warm hands, as always, felt great as they slithered across my skin.
As I had previously done to Shannin, she moved up my body, positioning her body so that she was straddling my legs. She applied a generous amount to my ass cheeks and upper legs and then moved up to my back. As Shannin massaged my back and shoulders, I turned and looked over towards Stacy. She appeared to be sound asleep. Shannin must have seen me looking and said, "Stacy sleeps about as soundly as I do." It originally sounded like a simple, matter-of-fact comment but the more I thought about it the more I wondered.
Shannin slid down my legs just a little bit. I was startled to feel my g-string being pulled aside and a finger tenderly massaging my butt hole. She then slid further up my legs, pinning her hand between her lower stomach and my ass. Slowly she pushed her hips forward, inching her lubricated finger deeper and deeper into my tight hole. My breathing was deep and labored. She leaned forward and I heard her whisper into my ear, "Relax and enjoy the ride."
Shannin ground against me as she leaned forward, pressing her chest and stomach into my back. She must have awakened from her nap in a horny mood. From the sound of her breathing it appeared that she was close to cumming as she ground her clit against the back of the hand that was cupping my ass. Her finger didn't penetrate me any further but with every thrust I could feel the tip pressing against my prostate. My cock burned a little as pre-cum started to seep out into my new swim suit. A sharp quick pain surprised me when she nipped on the back of my shoulder. Next, I felt her other hand press against the middle of my back as Shannin sat up, arching her back, pressing her hips firmly against me. She violently thrust her hips against me four or five times and then her body and her breathing seemed to freeze in time.
She stayed in this position for a good 20 to 30 seconds as I felt her tense body shake violently. During this time I looked over at Stacy. Her eyes were wide open and glued to Shannin. I don't know when she started to watch us but when she saw me looking at her she closed her eyes as if guilty from being caught. I kept looking at her and saw her eyes part slightly. I don't think she cared if I caught her looking but she apparently didn't want to be caught by Shannin. She continued to cautiously watch as Shannin's orgasm started to subside. I looked at Stacy's body and saw that her back was rising and falling in deep breaths. It was clear that she had been turned on by the sight of her horny sister having her way with me.