My wife treated my son (her step son) and I to a Disney Cruise for new years. Her sister came too (which i was fine with because of our sharing relationship).
We set sail and for the most part nothing happened. I would finger my wife at night and she would try not moan and wake my son. It changed when we got to Castaway Cay (Disneys private Island). We spend most of the day at the beach, my wife and i headed back to the ship while her sister and my son stayed and enjoyed the beach. My wife and i got to out cabin and started kissing. We stripped down and i pushed my wife over to our “Large porthole window (which overlooked the lagoon) and pressed her face and bear chest against the window. I then began to lick her ass and finger her.
She was cuming down my hand enjoying having my tounge explore her ass hole when the door opened. we stopped and turned around in surprise to find my sister in-law. She said that she dropped my son off at the kids club then she locked the door and quickly stripped down. I went back to eating my wifes ass as her sister got on the floor beside me. She took my dick into her mouth for a moment and slobbered all over it then pushed my wife away from the window and sat with her back against the wall and pulled my wifes pussy to her mouth and began the eat her out. I put my hand between my wifes shoulder blades and pushed her face back to the glass then i slid my dick up and down her ass before i lined the head up with her sopping opening and slid it rite in.
I loved having my wife bent over tits pressed against the window for all to see (at a long distance) she was enjoying having her clit sucked and pussy stuffed at the same time. She began to moan and i could feel her pussy clamp down on my dick as she sprayed her cum on her sisters face and down her chest. Feeling her tight pussy and hearing her cries of pleasure sent me over the edge and i unloaded a massive load if cum in her. When i was finished i slid out if her and took a step back. I saw a glob of my cum drip out of her used pussy and land on her sister’s chest. My wife lasted about another minute of her sister eating her pussy before she staggered back and flopped onto her back on the bed knees bent at the edge legs spread wide. I stepped forward and put my hand on my sister in-laws head and thrust my hips forward as she opened her mouth taking my dick in sucking it clean.
After about a minute i was at about half mast again she got up (glob of cum still on her chest) and knelt between my wifes thighs and finished cleaning her pussy. Then she climbed on top of her sister straddling my wife. I saw my wife lift her head and suck the glob of cum before focusing on her sisters nipples. I stepped behind them and slide my dick into my sister in-laws now wet pussy. I lasted a lot longer she had two orgasms before a blew my second load. With a load of cum in each sister i laid on the bed next to them to catch my breath.
We got cleaned up and picked my son up from the kids club and headed to dinner. We had one other sexual encounter before we made it home.