Sitting in the chair watching him take my yoga friend on our bed is now all I think about at work

its a nothing night, we are folding laundry in the bedroom and talking about dinner when he asks if I am still serious about the thing with sara. i say yes before I can overthink it and he texts her and she shows up in like twenty minutes with a bottle of wine like this is a regular hang. they start on the couch while I stay in the kitchen pretending to load the dishwasher and I kinda keep peeking around the corner. when they move to the bedroom I follow and sit in the chair by the window and honestly I dont even take my clothes off. he has her bent over our bed and I watch him slide in and she makes this sound I have never heard her make at yoga. I cannot stop staring at his hands on her hips and my own hand is in my jeans without thinking. I grab my phone and put this clip up so I can keep it because I already know I am going to need it tomorrow. he lasts forever and I just sit there soaked and useless while he finishes in her and she looks over at my face after. tbh I keep waiting to feel jealous but I only want him to do it again, like I keep replaying it in my head at work and idk if that is just who I am now. I already want the next time and its only been a few hours.