My wife and I joined a new gym and we had an introductory personal training session. We did a group training session together with a personal trainer at the same time. The trainer was super nice, very talkative, and was pretty much having a 1on1 convo with my wife the entire time during our session. I started feeling like the 3rd wheel haha. My wife is into fitness and health (she's super fit, has a crossfit body), so they both hit it off and had a lot in common. He was tall and handsome, muscular, an ex athlete, so he was basically "the perfect man".

The session continued and my wife and I would switch off doing sets as the trainer spotted us. The trainer had my wife laughing and deeply engaged into their conversation, topics ranged about his previous athlete life, skiing, exercise and nutrition, etc.

I noticed that when my wife would do her set, he would stand closer to her than he did when he spotted me. It wasn't creepy and she wasn't backed into a wall or anything, but it was up close and you could say he was borderline into her personal space. My wife is doing military presses while standing and they were standing facing each other, their faces were maybe 8 inches or so apart from each other (him bending his knees to get to her height). And then he tells her to breathe hard, and with each rep he would repeat, "breathe harder". By the second set, my stomach started feeling oozy, and I couldn't help but just watch with utter lust and dirty thoughts when it was my wife's turn to do her set. I'm standing maybe 4-5 feet away from them, and I see her breathing hard into his face with each rep. I am super turned on by this and didn't even realize this is something to get turned on about until now. My wife in her workout shorts, toned legs, workout tanktop, her face inches from another man, her breath being blown into his face. I am stunned and frozen, I have a boner at this point and there is no where for me to sit down.

I figure I have 20-30 seconds until it's my turn again, however, I couldn't stop watching them, I found it so sensual and erotic. He's now touching her elbows while spotting her, helping her get a few more reps in. His head moves a couple inches even closer. I see her eyes locked into his and I know her set is nearing completion as she is now visibly tired. I continue staring at them, I want to faint while watching them in front of me. Seeing their eyes looking at each other, so up close and personal, her breathing into his face, the sensualness of this is beyond what I can handle at this point.

It's now my turn to do a set, I pick up the dumbells and try to hide my boner, but the trainer had to have noticed it. I place the dumbells on the floor and sat while still grasping them.