Camping Surprise

My wife and I were on a long driving vacation, using our small pop up camper to sleep.  When we found our campground we would set up our camper, pull our our chairs and have a cocktail or 4.  Generally speaking, we didn't have campers parked right next to ours.  They would be 2-3 lots down, so we had little interaction with other campers.  We would enjoy our cocktails, BBQ something for dinner, enjoy a bottle of wine and head in for the night.  My wife has always been a looker.  In shape, nice round breasts and a great ass.  We had a nice sex life, but nothing out of the ordinary for our 20+ years of marriage.   That night, we had some neighbors.  This couple pulled up their car and pitched a tent.  He was in great shape and she was very hot.  Blond, great breasts, wasn't wearing a bra and had shorts on.  As they set up the tent, we walked over to introduce ourselves to them.  Chris and Kristine.  We offered them something to drink, since they had worked so hard on setting up their tent, and they agreed.  I made a mean gin and tonic.   After some talking  and getting to know them, I had to head up to the bathroom to take a leak.  Kristine asked if she could follow me, since she didn't know where it was.  As we walked up to the bathroom, maybe 40 yards, we were laughing and sort of bumping shoulders as we walked.  She even pushed her firm breasts into my arms as she walked.  The bathrooms were split in two sides, and included showers.  As we split up, I was alone in my side and settled up to a urinal.  There was an opening, covered in wire, above the middle wall which allowed me to hear Kristine peeing.  That along with Kristine's breast bumping had got me semi-hard, so as I pissed I rubbed my cock until it was hard and figured I would squeeze one out.  As I was rubbing my cock, I heard someone come in behind me.  Darn, I didn't finish, which was frustrating.  As I tried to tuck my cock back in my shorts I heard the footsteps come up behind me.  Standing next to me was Kristine, staring at my cock in my hand as I tried to get it back in my pants.  She said, 'do you need some help with that'?  I was speechless, and said sure.  So I turned toward Kristine and she grabbed my cock.  I reached over and grabbed her right breast and gave it a squeeze.  She pulled up her shirt to give me full access to the best set of breasts I have ever seen.  They were fantastic.  As she was rubbing my cock, she bent over and started sucking it.  Man was this crazy.  I had never done anything like this, not even with my wife.  I reached over to grab her ass and started squeezing her firm cheeks.  She stood up, turned around and pulled her shorts down, exposing her great ass.  She bent over and showed me the back entry to her pussy, ran her fingers through her lips a few times, buried a finger inside of herself, stood up and fed me her finger.  She tasted like candy.  WOW.  Was this really going to happen? I moved forward, and rubbed my cock head against her ass and her pussy lips.  She was so wet.  She moved back toward me, pulling my cock into her pussy.  First just the head and then all the way back, taking my full 7+ inches.  She moaned, quietly, as I started to fuck her in rhythm.  She was moving back into me with each thrust.  She was rubbing her clit as I fucked her.  I knew I wasn't going to last very long and started pounding her, making that slap sound of her ass and my balls.  Two more thrusts and I came hard, and so did she.  I pulled out, spurting a couple of shots on her ass.  She turned around and sucked my cock clean before kissing me and sharing our tastes.  She game me a wink, pulled up her shorts, pulled her shirt down and left the bathroom.  I was in shock.  What just happened. I gained my composure, made sure there wasn't any evidence (cum on my shorts) and headed down.  As I walked down, I could see Chris sitting next to my wife, his hand on her leg, laughing about something.  As I came into the camp area, I took Chris's seat next to Kristine, who thanked me for helping her find the bathroom.  I am not a good lier, so I must have looked guilty as hell.   After another cocktail, we said our good nights and headed into our campers.  As we laid in our bed, we could hear Chris and Kristine making love, very loud, which we both commented on.  As I kissed my wife good night, she asked me what I had snacked on and what a nice taste I had in my mouth.  She also told me that Chris had it on her, asking her to give him a hand job/blow job while we were in the bathroom.  She said she laughed and told 'that's not happening'.  Man did I feel guilty for what I had done, but I got hard again just thinking about what had happened to me and snuggled up to my wife and convinced her to let me fuck her from behind.  She was pretty wet, so Chris's request must have made her wet.  I fucked her hard from behind, cuming again and making my wife cum too.  I am sure our neighbors could hear us.  I wanted them to hear us. When we woke up in the morning, Chris and Kristine were gone, off on their next adventure as campground neighbors.  We got organized and off we went to our next camp ground.  Me with a masturbation memory of a lifetime, my wife with a what if memory (or maybe she also had a memory and didn't tell me???) I never told my wife about my bathroom experience and never did it again, but I still feel guilty at times.