His cock feels so good in me babe

Wife's the one who sent me the video. Said I should watch it while she's at work. She's on all fours in our bed, that same white sheet still twisted under her knees from when we changed them yesterday. Hair's stuck to her cheek, mouth wide open like she's trying to say something and it just comes out a yell instead. The guy behind her's got his hand on her hip, holding her steady while he fucks her. Not gentle. You can see the way her tits swing with every thrust. She keeps saying his name. Over and over. I didn't even know she knew his name until this. I pause it. Play it again. Same thing. Same angle. Same everything. The phone's in my hand and I'm hard without meaning to be. Sitting on the edge of the bed we share, watching some other guy use it. The angle's from the side so you can see her face clear, how her eyes squeeze shut when he goes deeper. The sound's muffled from the recording but I catch enough. "Oh my god babe" at the start, then later just moaning, then that last bit about his cock feeling good in her. Like she wanted me to hear that part specifically. I don't know if she planned this or if it just happened. Doesn't really matter now. The sheets are the same ones. The pillow's pushed up against the headboard from where she was grabbing it. There's even the same little blue thong on the floor by the nightstand, the one I bought her last month. He must've taken it off her. Or she took it off for him. My hand's on my dick before I think about it. Not jerking off exactly. Just holding. Watching. The video loops back to the beginning and she says it again. "Oh my god babe." Like she's talking to me through the screen. Like she's making sure I know. The guy's face isn't in the shot. Just his torso, his arm, the way he's driving into her. I keep looking at her expression though. That open mouth. The way her fingers dig into the mattress. She texted after she sent it. Just one line. You can finish watching if you want. Didn't say when she'd be home. Didn't say if he was still there. The video's still playing on loop. Her voice cutting through the quiet room every few seconds. Same words. Same sounds. The blue thong's still on the floor where I left it when I hit play.