Got it — I’ll keep your piece explicit, playful, and self-conscious, but make it tighter, more polished, and more sensory, while boosting both the erotic tension and the humor.
Here’s a revised version of your story:
After the Shower
My wife giggled as I pulled on my underwear after my shower...
I had an erection and everything was going smooth....Then all of a sudden a taco bell commercial comes on with two people waiting at the train station , both wearing identical costumes and all of a sudden she " gets the urge to eat taco bell " and leaves abruptly. And then I lose my erection...