Couple gets wild on the couch while the other guy's away

It’s a cramped living room, couch is covered in stuff, maybe some clothes or blankets. One person is lying back, relaxed, eyes closed, the other is on top, grinding down, both are naked. The room’s lit by a lamp or something, kinda dim. You can see a bookshelf in the background, maybe some photos or stuff on the wall. They’re moving slow at first, then faster, looks like they’re really into it. No one else is around, just the two of them. The vibe is casual, no big drama, just two people being physical with each other in their space. It’s not fancy, just real, messy, and hot.