The backstory to this is posted on my profile, for those interested.

Ch. 1 Kim and Julie made plans for Julie's family to come to our house for the kids to play in the pool one evening.

To reset for those who have been following along since Thailand: I am 50. Average dad body, average looks, average height, average length, just a normal dad. My wife, Kim, is 45, 5'6" with blonde hair, a tiny waist and stomach, B cups, and very pretty. Julie is 42, 5'3" darker hair with highlights, great natural full lips, and D or DDs, with a great ass and stomach. Also, very pretty. Her husband Tom is mid 40s, a little taller than me, maybe 6' and a little thinner than me.

We made it easy and ordered pizza and the kids swam and played while the adults talked.

I never know if the parents will bring swimsuits when we have pool parties. I don't know if it is that middle-aged people can be a little insecure about wearing swimsuits or they just think it is for the kids.

I enjoy swimming and playing games with the kids. I am comfortable with my aged body and just don't give a shit. So I jumped in after about half and hour.

I was pleased that Julie was in the water a few minutes later.

We were throwing balls, throwing kids, squirting and dunking each other. Just horsing around and having fun. Julie seemed to purposely find ways to press her body against me whenever she got the chance. Ass pressed into my crotch. Her breasts against my arm or back.

It definitely seemed like more than incidental contact based on how much space she had available to avoid me and how long she pressed against me. I was enjoying the flirtation. Was trying not to get aroused as the kids were in the pool.

About 10 minutes later Tom jumped in. Kim went for the hot tub.

After a bit the kids moved inside to play video games, air hockey, ping pong, and whatever and all of the adults ended up in the hot tub.

The two women sat next to each other. Pretty close. Nothing overly flirtatious, at least above the water.

Then Tom and Julie said they had to go because Tom had to wake up before dawn to take their daughter out of town for a volleyball tournament.

Their son did not want to leave. It was getting late, almost 9, but it was summer so no school for the kids. We said he was welcome to stay. They live about 15 minutes away. I offered to drive him home later or let him stay the night.

Julie suggested that both she and the boy stay a bit longer. She'd just poured a glass of wine and said she and the boy could Uber home in an hour or two. Tom said he would Uber and he'd leave her the car as it might be difficult to get an Uber in suburbia later.

So Tom and the daughter left. The son and my kids were inside playing and Kim, Julie and I made our way back to the hot tub.

Julie sat right next to Kim, even though the hot tub is big enough for 10 people. A few minutes later I see arm movements that look like Julie is caressing Kim's thighs.

Before I know it, they are kissing. Kim looks up a minute or so into the make out session to see my reaction, and to make sure I am okay with it. I nod and smile and lean back in the opposite end of the hot tub and watch.

Julie straddles Kim and puts her hands up Kim's top. Pretty much lifting off her top. Julie then lifts her own top up and puts her breasts right at Kim's eye level.

Kim hesitates, looks around to see no kids are there, and then takes a nipple into her mouth.

I am so hard at this point and just slowly stroking myself under the water.

Kim hears something and gets a little freaked out that one of the kids is coming outside so she gently pushes Julie off a bit. As Julie turns to sit, I get the first glimpse of her spectacular tits. I knew they were big, but they are perfectly shaped. They stand up well on their own, her areolas were a good medium size that were proportionate to the breast size, and her nipples were slightly long.

The girls snuggled, touched each other's legs and breasts, kissed some, and drank wine as we chatted for the next hour or so. Kim came over at one point, sat on my lap, stroked my hard dick, and kissed me.

In a whisper, she asked if I was okay with this. I reminded her that I have always said I'd never be jealous of anything she does with another woman as long as we are open about it.

It was about 10:30 now. Even in the summer that's a bit late for the kids on a Thursday night. So we got out.

Julie was a little tipsier than any of us had realized. The wine, the heat, the sexual build up all hit her as she got out.

It did not seem like a good idea for her to drive. So we decided they would sleepover. She had to work in the morning and wanted us to promise to wake her early.

We showed her the guest room and she gave a drunken pouty face. Kim and I looked at each other and silently agreed she could come to our room.

Our room is on the far side of the house from the kids' rooms. It is long single story house and it would be hard to hear a gunshot from the other side of the house.

The women got into the room only seconds before I did, but when I walked in both were already topless and Julie was on top of Kim in the bed.

I sat on a loveseat in the corner and watched.

Julie kissed Kim's neck, then down to her breasts, and down her stomach and then pulled off her bottoms.

As Julie licked her to orgasm, Kim and I would swap between making eye contact and watching Julie work. I also enjoyed seeing Julie's great ass hiked up in the air. Her lips showing a bit around the edges of her bikini bottoms. I kept my shorts on, but was stroking through them. I was so hard and turned on.

Kim came pretty quickly and then it was so sexy watching her lick her own juices from Julie's face after.

Both laid side by side on their backs for a couple of minutes. Julie's tits were amazing to look at even while laying flat on her back.

Kim must have thought the same as she soon had a nipple in her mouth.

Kim has great tits. They are smallish, but perfectly shaped with great long and always hard nipples. But Julie's were something else. They were even bigger than our previous FFM partner Alex's, and also looked fantastic.

Kim doesn't know how spoiled she is that both of her first bi experiences were with women who have amazing tits.

Kim spent a lot of time licking, sucking, nibbling on Julie's tits. Her hand would sometimes drift down and rub Julie's pussy. I could see Julie tense when Kim found her clit. Other times Kim would slide a finger inside and Julie would pulse her hips.

Kim then went down on Julie. Julie looked right at me as I stroked myself. I'd lost the shorts by now. I stood, but didn't move closer, and just stroked as I watched Kim work and Julie's facial expressions change.

Julie came and squeezed her thighs tight around Kim's head. Julie's eyes never left mine the whole time. Until they closed as she reached climax.

They cuddled and kissed and I stood there stroking softly and slowly so as not to cum.

Julie gestured toward me and told Kim that I seem to have been left out.

She said Tom would not be okay with her doing anything with a man, but she would enjoy watching us.

Kim walked over to me, knelt down, grabbed my shaft and licked the head. Julie was rubbing her clit while watching.

I was so turned on from all the build up and I came after just a few minutes. But I put my hand on the back of Kim's head and kept thrusting forward. I can usually stay hard if I keep stroking after cumming. Kim is usually only up for one round, so she doesn't regularly do it. But I said keep sucking so I can stay hard to fuck you. And she took over.

After a minute or so it was clear I was staying hard. So we climbed in to the bed next to Julie. Kim likes to be on top so she climbed on.

Julie sucked one tit and I sucked the other as Kim lifted up tall and took me deep inside. Julie's body and incredible tits were pressed against me as she sucked on Kim.

Kim then started riding. Grinding into me. She loves the stimulation of her clit grinding against me as I am inside her.

I love when Kim rides me. She looks so beautiful. Her tits look perfect. I can see her pretty face, and the changes to her facial expressions.

Julie laid back beside me, pressed against me and watched while playing with her own nipples and rubbing her clit.

Kim started cumming and that set Julie off again.

When I stay hard after cumming, the second one can take a while. Kim was tired so she laid beside me. I was in the middle and both were cuddled up to me. Rubbing my chest and then kissing each other over me.

After Kim had caught her breath, I got on top of her, lifted her legs on my shoulders and started fucking her. Slow and deep at first. Julie started making out with her and then straddled her face, facing me.

She took Kim's feet and pulled them toward her. Allowing me to go deeper. Julie ground her pussy against Kim's face. I wanted to suck her amazing tits or kiss her, but didn't want to break any rules. Our faces were so close. We just looked right at each other as I fucked Kim until I came. I don't think Julie came from riding Julie's face, but as soon as I pulled out, Julie burried her head in Kim's pussy and licked out all my cum while still pressing her pussy into Kim's face.

She then got up and kissed Kim. I couldn't see if she kept any of the cum to swap or if she had just swallowed it.

We laid in bed and cuddled a while. Then we all got into the shower.

Julie had no problem washing Kim everywhere. Surprisingly, she let her soapy fingers run all over every part of my body except my dick and balls. She rubbed against me. Her ass pressed against my dick a couple of times. That got me hard again.

I didn't wash Julie at all. This night had been too good for me to be the one to break any rules. But damn, I wanted to feel her tits.

After we got out and dried off we went back to bed. I ended up in the middle with both women's heads on my chest.

I was still hard, but plenty satisfied and didn't need to cum again.

Julie asked Kim if it would be okay for Julie to be in the middle. Kim didn't mind.

Then Julie spooned Kim from behind and asked Kim if I could spoon Julie. Kim agreed.

Julie felt my erection press against her and then lifted her legs apart to let it slide through her thighs. It was right against her still warm pussy.

She clenched her thighs and pressed her pussy down toward it for a while. It might not have taken much more stimulation for me to have cum, if I hadn't already cum twice.

We feel asleep like that.

We had set the alarm for 4, it was after midnight when we feel asleep. I woke to Kim crawling into my side of the bed and giving me a kiss.

We got Julie up and she gave me a big naked hug and a kiss on the cheek. The women exchanged a short, passionate kiss. Julie was hoping they'd be home before Tom woke and that he may not notice they didn't make it home until morning.

There was no indication of whether this would be a one-time thing or the start of something. But it was fun.

Crazy to think that less than six months before, my wife had never done anything like this.