So I've been married now for 10 years and my wife decided to book a getaway for my 40th. We ended up getting a "party" home at a cool resort. It was 5 bedrooms 4 bathrooms. We brought our kids, mother in law, her sister and husband and 18 year old son.
After exploring the house and getting out rooms picked. I decide to go out to the store to get us groceries and booze. Everyone else was going down to the pool which was next to us in the resort. I ended up back at the house and it seemed nobody was there. I loaded the fridge and headed up to our room to change and bring drinks to the pool for the adults. I got to our room and heard what sounded like the shower on. I didn't realize my wife came back so I got undressed and quietly walked into the hallway that led to our master bath. It was really cool, had a jacuzzi tub, but also a large circular glass shower. You could kind of see in, but looking out was not clear. I got to the entrance and noticed right off the bat my wife wasn't in the shower. It was her sister and her husband.
I got close enough to see in and could see her sister, we can call her Amy, on her knees and it appeared she was sucking her husband's cock. Even if I weren't standing there fully nude, this sight would have gotten me aroused. I don't really care for her, but sex is still sex. What made it hotter for me was that it was someone I have known for years now. I watched as she was sucking and jerking his cock fairly hard, even gagging a couple of times. I was now fully hard and started to slowly jerk my cock while watching. After some time, she stood up and they began making out while she jerked his hard cock. From where I was at I could see his cock pretty well. While drunk she would brag about her husband's cock size. Funnily enough, what I could see from there, it wasn't.
Amy then bent over towards the wall of the shower and I saw her husband go behind her. He knelt down and from what I could see, started licking her pussy/ass from behind. Amy let out a louder breath and moan. I started stroking faster listening to her moan. I could now also see her larger breasts pressing up against the clear blocks. Her dark areolas and thick nipples were in clear view. I could feel myself building, so I slowed down. After a bit, her husband staood up and entered her from behind. I'm not sure if it was pussy or anal, but Amy let out another loud moan as he entered. He started off slow and after a couple of minutes of slow grinding, Amy said fuck me harder baby. As he pounded her ass harder, her now soapy tits were bouncing up against the wall. She was moaning louder and louder as he fucked her. At some point she said don't stop baby. I'm close. I looked around the room. Their dirty clothes were laying next to the door. I grabbed her dirty used panties and looked them over. In the pussy area, there was a white stain, I'm guessing wetness before getting in.
As I was exploring her panties, I happened to look up just in time for her to say, I'm cumming baby. He kept pumping her as he let out gasps and moans. After what seemed like she orgasmed, he said I'm close baby. Amy jumped off and onto her knees. They were facing me so I could see some of the action, but not clearly. I could see her now back at sucking him hard. I started back up jerking my cock, with her panties in my hand. My pre-cum was smearing all over the inside area of her panties where her pussy goes. He said I'm close. Amy said cum for me, baby. I want to taste you. I couldn't hold back anymore, I exploded cum all over her panties. As I finished coming, I heard him let out a moan and Amy said yes baby. She drained his cock into her mouth. I could see that she was swallowing all of it. I made sure my cum drained, into her panties. I balled them back up and put them under their dirty clothes, grabbed my swim suit and drinks and headed to the pool.
My wife said, did you see my sister in the house? I played dumb and said, it sounded like they were in our shower, so I got dressed and came out here. She joked and said, I bet you took a look. I said yeah, but they were just getting in, I saw her ass. My wife said, I bet you liked that. I laughed and said, it was ok, not yours. They came out about 20 minutes later in suits. I guess she told my wife they fucked in our shower. Little did they know, I already knew that.
I must say, I still don't care for her, but I enjoyed her sexuality in the shower and her breasts against the wall.
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