Last night, my wife's friend came over, unannounced, and stayed for more than just coffee. I watched from the shadows as he pushed her against the wall, his hands roaming her body, her breath quickening. She didn't stop him when he hiked up her skirt, didn't pull away when he slipped a finger inside her. He fucked her right there, in our kitchen, his cock slamming into her, her cries of pleasure echoing off the walls. I could see her face, her eyes closed, her mouth open in ecstasy. He finished inside her, his body shuddering, her juices mixing with his. Today, I can still see the evidence of their tryst, a sticky reminder of her betrayal.