It all started five years ago. My wife and I were on vacation with her sister and her husband, and another couple. One morning we were all loading into the shuttle van that was taking us to the beach. We were not the only ones waiting to get on so I went to the last row with my wife. My sister-in-law Donna followed us to the back, but before her husband could get in, another couple loaded in the back. The seat only had room for four.
"Instead of pushing back to the front can I sit on your husband's lap," Donna asked.
"If its alright with Dan its fine with me," responded my wife.
I nodded and Donna sat down on my lap. As the van pulled away I smiled as I remembered everyone was in bathing suits. Donna had a cover-up on over her suit but when she sat down on my lap, it rode up and left her bikini bottom exposed.
For a while I tried to ignore the fact that her ass was on top off my cock. I looked out the window and drank my coffee while my wife and Donna talked about the day ahead.
Soon my thoughts turned back to Donna and her ass on my now semi-hard cock. Donna has been a jerk-off vision of mine ever since my wedding day when I walked in on her topless and in a thong. She may have small tits but she has a nice, big, round ass. I always wondered what that ass would feel like and now I had my answer.
I was getting harder by the minute and I knew she must have been feeling my cock on her ass by now. I looked at my wife and feigned boredom. Donna's next move surprised me. She started to slowly move her ass back and forth on my cock. She exaggerated every bump we hit in the road by bouncing on my cock. I was hard as a rock.
After 15 minutes of torture, just when I thought I was going to come in my bathing suit, the van arrived at the beach. As my wife started to climb out of the van I quickly reached around to the front of Donna's bikini and pressed my hand against her pussy. As she knocked my hand away, a moan escaped her mouth.
At the beach everyone was relaxing and enjoying the sun. I got up and offered to go get some drinks from the bar. I was not surprised when Donna offered to come with me. As we walked away from everyone Donna turned to me.
"I enjoyed teasing you on the way over but I didn't mean for you to get so worked up," she said with a smile.
I looked her straight in the eyes and said, "Five more minutes and I would have come."
She laughed and said, "Too bad it was a short ride."
We got the drinks and returned to the group. For the rest of the day I tried not to stare at Donna's ass. When she moved onto her stomach I was thrilled. I sat in my chair with my sunglasses on and looked at her ass for about an hour. I started to get hard thinking about that nice, big, round and now sweaty ass!
Soon it was time to catch the shuttle back to the hotel. All day I had thought about how to get Donna back on my lap for the ride home.
When we got into the van I headed for the last row again. This time Donna's husband was right behind me. When we sat down in the last seats Donna quickly jumped back there to sit on her husband's lap.
I was crushed when I realized there was no chance for me to get that fine ass back on my lap for the way home. The van started to drive and John (Donna's husband) and I talked about going out for steaks.
I looked over at him and I noticed Donna moving her ass on his lap. I couldn't believe she was doing it to him now, instead of me. This time there was no hiding what she was doing. She was grinding him hard and soon he stopped talking to me.
I knew then she was going to make him come. I watched her face as she moved her ass on him and she had her eyes closed in ecstasy. It was hot!
I started to get hard again and when I looked up she was looking right at me. She moved her body so she could lean back against him and really get her ass moving. All the while she never stopped looking at me.
John whispered something in her right ear.
"Oooooohhh," moaned Donna. She moved her ass faster and pushed down harder on her husband.
I started to rub my cock through my bathing suit. She looked down and saw what I was touching myself and licked her lips.
"Yeah baby ride it," whispered John as he grabbed her hips and started to dry hump her ass. I guess maybe the alcohol and sun mixture was enough to remove his inhibitions. He no longer cared if I saw what was going on. He reached up and grabbed her tiny tits.
"Oooh yes John, squeeze my tits." Donna said through gritted teeth.
John buried his face in her neck and growled," I'm coming!"
It was too much for me to handle. I jerked my cock faster and I too came in my bathing suit. When I opened my eyes Donna was looking at the stain on my suit and smiling. She collapsed on John and all was quiet.
Soon we arrived at the hotel, climbed out of the van and headed to our separate rooms.
When we got to our room my wife asked," What happened in the back row? When I looked back to talk to Donna her face was all flush."
"I think Donna was dry humping John's cock." I said with a smirk.
"I'm not surprised. My sister is such a slut!" laughed my wife.
After that vacation my sister-in-law took every opportunity to tease me with her ass. She knew I admired it and loved to show it off. She would bring new bathing suits over to our house to swim and model them for my wife while we sat by the pool.
"Does this suit make my ass look big?" She would tease.
I would pretend not to look, but my wife knew better. I was an ass man and Donna had a big juicy one! My wife seemed to enjoy my horny moods after her sister left. Her ass would always get extra attention from me after a visit from Donna.
One Monday after Donna had been over for the weekend I went down to my basement to look for fishing equipment. When I opened my tackle box I was pleasantly surprised. My sister-in-law had put a pair of her black thong panties in my box.
I got hard immediately thinking about her sneaking down there and hiding the panties. She really was a slut! I brought them up to my nose and sure enough they smelled like wet pussy.
I starting jerking off with them wrapped around my cock. I imagined the panties stuck between Donna's big, beautiful ass cheeks. I pulled them off my cock and brought the panties up to my nose again. This time smelling right where her ass touched them. After one long sniff I quickly put the panites back to my cock and I came all over them.
After I cleaned up I called Donna on her cell phone.
"I just want to say, thank you," I said to my sister-in-law.
"Wow! It sure didn't take you long to find them!" Donna laughed.
"It took me less time to come in them then it did to find them!" I answered.
"You are so bad, Dan! Don't let my sister hear you talk that way." sneered Donna, "I'll see YOU at Thanksgiving."
My wife and I arrived at Donna's house on the eve of Thanksgiving. It was clear from the open bottle of wine on the counter they had started without us.
As we said our hellos I noticed Donna was wearing a very tight fitting dress that hugged her beautiful curvy ass. I wasn't the only one who noticed either.
"Wow Donna, did you get all dressed up for us?"commented my wife.
We all took turns doing kitchen chores to prep for the big dinner the next day. At one point Donna and I were alone in the kitchen with John and my wife setting the table in the dining room.
When I turned around Donna had her dress pulled up to her waist and was shaking her ass at me. She was not wearing any underwear at all and I could see her pussy lips as she bent slightly.
I wanted fall to my knees and start licking and kissing that big beautiful ass but I had to play along with our spouses just a room away. I did the only thing I could think of which was to pull out my cock and start stroking it.
"Are you crazy?! Put that away," Donna whispered.
"I can't help myself when I see your ass," I smiled.
When we heard our spouses coming back we both quickly fixed our clothes. I did not have as easy a time as she did since I was totally hard.
When my wife and John came back into the kitchen, Donna was bent over, looking in a cabinet for a bowl. John walked up behind her when he saw this and started to dry hump her ass.
"Oooooh yeah baby shake that ass!" John said as he pushed up against her.
"Knock it off you pervs," my wife sneered.
