My name is Johan, I am a 35 year old man that has been married to my wife, Sarah (36 year old), for 8 years. We are really happy together and our sex life is good. She is very wild and she always wants more. Her sex drive is way higher than mine is. She is way more kinky than I am as well, I am kind of basic. She has told me before that one of her biggest dreams is to have sex with another man, with or without me. I know how she is and I know myself and what I fancy, I am totally fine with her sleeping with other people as long as I have agreed on it and as long as I don't need to take a part in it.
Half a year ago we started to go to the gym, she is a bit chubby, but in a cute kind of way and I wanted to gain some muscles because I am a bit thin. I had no idea where to begin or how to work out so Sarah and I decided to have a personal trainer. We learned a lot from him, his name is Kevin and is about 40 years old. He had this leader instinct and was very strict, dominant and clear in his way of teaching us to do the exercises. He has a muscular body and masculine jaw line. He used to instruct in a tank top so his muscles and chest hair were always exposed. I knew from the beginning that my wife found him attractive, I knew which type she had. To be honest he had this masculine look that most people find attractive, I couldn't blame her.
In the first month the workout started out great, even though he was not as friendly and nice towards me as he was against Sarah I still learned a lot and found the gym somehow nice. The more time passed, the more Kevin started to focus on Sarah. In my opinion he was a bit too close to her, correcting her hips and postures a bit too much. I could see on her look that she liked him touching her. He usually ignored me and let me work out by myself. I was OK with that but I was still not very sure of the exercises and machines yet.
The conversation I had been expecting came up. Sarah told me that she was attracted to our gym instructor and that she really wanted to involve him in our acts and that she thinks that he would agree on it. I didn't doubt Kevin would agree on it, he is always very close to Sarah and to be up front I did not like the fact that they had a sexual tension between them two but I can't deny my wife's sexual drive, it would not be fair. I told her that I knew we were gonna have this conversation and that I am fine if they have sex, as long as she tells me before and that I don't get to be involved physically. She was jumping up and down and thanked me and kissed my head.
After our next training session I asked my wife if she was ready to go home, Kevin was helping her to stretch. She said that I could go home and that she would come home later. She gave me this look as if it was alright, I nodded and told her that we would meet later. Kevin gave me a weird smile that I thought about on my way home. The hours went by and I kept looking at my phone, I thought she would be home already. I told her I was fine by this whole thing but I couldn't help but to feel jealousy. I started to feel a bit anger towards Kevin.
The weeks passed by and she kept meeting Kevin at home. I asked her if this was not a one time thing and she said we didn't decide a limit but if I wasn't fine with it I could just tell her. I told her it was fine. I noticed how much it meant to her to have another lover and to be fair I could not keep up with her sexuality so at least she gave me a break.
A week ago I actually felt very horny one evening when me and Sarah were watching a movie, I started to seduce her but we kept being interrupted by her phone. She was getting text messages from Kevin, I tried to ignore it but I felt so annoyed. After each text message she had a huge smile in her face. I could not stop this right now though, that would bite my ass later and if she gets sexually frustrated she can be really tough and mean towards me. I had to do something do...
"Ok, I want to be involved next time you guys meet!" I said.
"Oh...I mean that would be really nice but I don't think Kevin likes you so much. But I guess I can ask him if you want to." She said.
"Yes, you spend a lot of time with him and I can at least get to know him better, I don't really trust him.
"Johan, stop it...If I trust him, you should."
"I guess... I want to be involved when you guys have sex. We can do this threesome you have been speaking about." I said in order to gain some kind of control over the situation again.
"I will ask him if he would be fine with that". She replied me.
We all agreed to meet in our home the next day. It was a friday night and Kevin was gonna come any second now. I felt kind a nervous, I didn't know what to expect and how a threesome would be like, now I can't back out though and this will be my chance to gain some dominance back. Kevin stepped inside, he had just had a training session so he was still in his workout clothes and you could feel the air of sweat around him. He was very polite to Sarah but he still was a bit short towards me. I thought about being direct so I said:
"So, are we gonna do this or not? How do we start?"
They both looked a bit chocked.
"Johan, calm down. Kevin hasn't even showered yet and he just got here." Sarah said.
"No worries, but we need to do some warm up first. Johan, lay on the floor and start doing some sit-ups!" Kevin said.
"What? Now?" I asked.
"Yes, Trust me! I will work out as well. You know that Sarah likes seeing men work out, right?"
I laid down on the floor and did some sit-ups. I was doing 10 of them and then I laid down on the floor, looking up trying to catch a breath. Kevin started doing squats. He was wearing his white gym shorts while doing it. He got closer and closer to me while doing them. He ended up putting both his feet at the side of my shoulders and began to squat down again. He froze when he reached the squating position and his ass was just above my face. I could even smell the sweat from his ass crack.
"Kevin! I have your ass in my face, go away!" I said.
