A/N: Okay, this is my first piece of fan-fiction so I would really like any adive you culd give me. I'm also trying to set this out like an actual episode, so that's why no Sam, Dean or Cas has been mentioned yet. Since I have no idea of the sixth series, I'd say this could take place somewhere in the fifth season, after I Believe The Children Are Our Future.
"Happy birthday," the woman whispered to her husband. He smiled as she set down the plate of stir-fried chicken and rice in front of him, with a kiss on the cheek added.
"You're amazing, darling," he told her before taking a spoonful of the food. But no sooner than it had entered his mouth, he felt sick. His food tasted weird, especially the rice… it was like it was alive in there!
He hastily swallowed it but still that wriggling sensation was there, like whatever there was on that forkful of food was trying to… to crawl back up his throat? He looked down at the plate and saw that all the little white grains of rice were now wriggling… oh God, they were maggots!
"Wh-what did you put in this?" he asked his wife. She looked perplexed.
"Erm, chicken, stir-fried veg and rice… oh and I added some soy sauce. Why? I thought this was your favourite?" Her shadow flickered against the wall in the candlelight. He looked back down at the plate but the food was still. It was normal again.
"Y-yeah, yeah it is. Look, sorry, I'm just being a bit weird. I'm kind of stressed at work, y'know? It's… it's just playing with my mind a little. I'm sorry, I don't want to ruin this lovely dinner."
"I guess sleeping with your secretary will make things really stressful," his wife answered maliciously. He looked at her, shocked. How did she know?
"That's right, I do know. I thought things were okay between us since Lucas… when Lucas died. Clearly I was wrong." The memory of her lost son brought a tear to her eyes.
"Look, I'm truly sorry. I – I was affected too, you know? I don't know what came over me, but it happened. But now it's over between us, I wouldn't leave her for you. I love you Mary-Ann."
"It's too late for that," Mary-Ann muttered. She stood up and grabbed the largest knife she could find, the steak knife, and thrust it multiple times into her husband's body until eventually he fell down dead.