When we got back to the house, we cooled down in the backyard. Carol stripped off her clothes and jumped into the pool. It was the first time she’d gone skinny-dipping since I arrived. I guessed it wasn’t a big deal, based on the things we’d done together.
Bill and I joined my sister in the pool. We milled around in the refreshing water, enjoying the warm morning. After about a half-hour, we got out and sat on lounge chairs.
Carol reclined in her lounge, her breasts sitting proudly on her chest. She glanced at me, smiled, and said, “Have you gone skinny-dipping before?”
“No, this is my first time,” I replied. “I like it.”
“You like looking at my tits,” Carol said, then she chuckled.
“What’s not to like, baby,” Bill said.
“Do you know what I want?” Carol said.
When Bill and I shook our heads, my sister said, “I want someone to put sunscreen on me.”
Bill got up, retrieved a bottle of sunscreen, and tossed it to me. I smiled as I moved to my sister’s chair. When I told Carol to roll over, she shook her head. I applied the lotion to her stomach and started coating her. When I ran my hands over her breasts, she let out a sigh.
I finished with Carol’s front, and she flipped over. I smeared the sunscreen over her back, taking extra time massaging her ass. She pushed up, wiggling against my hand as my fingers slipped between her butt cheeks. I pressed my fingertip against her anus, watching for any sign she didn’t like it.
“Is this off-limits?” I said.
Turning her head, she looked into my eyes, smiled, and said, “No, my ass isn’t off-limits. Is yours?”
I shrugged my shoulders, causing my sister to grin. While I had played with my ass while masturbating, no one else had ever touched me there.
“Don’t let her fool you, Matt, Carol loves her ass played with, and fucked,” Bill said.
“I’ve never had anal sex,” I said.
Carol winked and said, “You will.”
I returned to my lounge, my cock hard from touching my sister. She saw my hard-on, smiled, and got up. Placing a towel on the patio, Carol leaned over and took me into her mouth. As she blew me, her spit ran between my ass cheeks. Using one of her hands, she started playing with my tight puckered anus. I gasped as she took my cock into her throat and pushed a finger into my rectum.
“Oh, fuck,” I said when my sister started moving her finger in my ass.
Pulling her mouth off my cock, Carol smiled and said, “Do you like having your asshole finger fucked?”
“It’s different,” I said.
My sister returned her mouth to my cock. Adding a second finger, she stretched my anus. A few moments later, she massaged my prostate, causing me to shoot my semen into her mouth. She continued pumping her fingers in my ass as she sucked and swallowed my cum.
Carol removed her fingers from my ass and released my cock. Grinning, she headed for the house.
“She can be one wild woman,” Bill said.
“That’s an understatement,” I replied as I recovered.
“Wait until she does your ass with her strap-on. It’s way more intense,” Bill said.
I looked at Bill, shaking my head as he grinned. Carol came outside, moved the towel to the side of Bill’s lounge, and gave her husband the same treatment she’d given me. I watched in awe as my sister worked three fingers into my brother-in-law. He held his legs back, howling as he came. Carol swallowed his cum, removed her fingers, and went back into the house.
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