I've spent hours and hours searching for this, so I hope somebody here knows it.
As title says, a cuckold/cheating story where a girl sits in the middle of a couch, a guy on each side of her, and a blanket covering them. The husband/boyfriend is in the room, pretending not to see/not aware of what is going on. She jerks both of them off underneath the blanket, and at some point, the husband/boyfriend looks back/comes back to find that she's disappeared. Asking the guys where she is, they make some excuse that she went to the bathroom or something, but actually she's underneath the blanket sucking one of them off.
This one below is a lot like it, but it's not quite that one.
https://www.literotica.com/s/just-one-of-the-guys-ch-05a
As title says, a cuckold/cheating story where a girl sits in the middle of a couch, a guy on each side of her, and a blanket covering them. The husband/boyfriend is in the room, pretending not to see/not aware of what is going on. She jerks both of them off underneath the blanket, and at some point, the husband/boyfriend looks back/comes back to find that she's disappeared. Asking the guys where she is, they make some excuse that she went to the bathroom or something, but actually she's underneath the blanket sucking one of them off.
This one below is a lot like it, but it's not quite that one.
https://www.literotica.com/s/just-one-of-the-guys-ch-05a