He was fucking her, Dan realized in a flash. He was fucking her and his wife’s wet pussy was eagerly taking Charlie’s cock. The epiphany made Dan instantly hard. Turning his head, and inching a little further out the bedroom door, Dan could make out in the dimly lit living room the silhouette of his wife. At first she was just a dark blob eclipsing the drawn shades of the window that were back lit by an outdoor street light. But as his eyes adjusted further, he could make out her hair and the way it bobbed up and down off her shoulders.
Concentrating and remembering to breath, he crawled a foot further out into the short hallway that led to the living room. His wife made no indication that she suspected he was there. As Dan got closer, the image of his wife came clearer into view. Now Dan could make our her breasts as she bobbed up and down on Charlie’s cock, her two round orbs heaving to the same rhythm as her hair. Her moans could barely be heard despite the fact that Dan was now no more than eight feet from the couch.
Stopping to watch, Dan noticed his own cock getting hard as he sat and watched. Was this normal, he thought to himself. A husband wasn’t supposed to get a hard on as he watched another man plow his wife, he wondered.
Shaking the distraction from his head, Dan continued to lay there, his erection digging into the carpet beneath him.
“I’m close,” Dan heard Charlie say as his hand cupped his wife’s breast once more as he pulled her forward in order to suck on her nipple.
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Source: reddit.com/r/Erotica/comments/ijnkki/a_friend_in_need