It Takes Guts (слэш)

Every time Dean scoped out a chick at a bar, laid on the charm—regardless if he ended up in their bed or not—Sam was irked. It was like nails on a chalkboard. The constant inability for Dean to keep it in his pants drove him nuts!
It took a damn long time for Sam to grasp these feelings stemmed from jealousy.
When he finally accepted the fact, Sam realized he had a voice. Sometimes, he'd see how loudly he could complain, hoping Dean's "attempted conquest" was turned off by their bickering. Sam no longer held back when calling Dean out on his cheesy pick-up lines, or telling him he could do better.
The playful teasing and joking—it was returned—and maybe Sam liked the attention. With the right amount of finesse, the scene would change into a easy night: spent together.
Tonight was one of those times where Dean was angling to blow off some steam. This was where Sam would normally, obsessively, act as the wrench, preventing Dean from getting laid.
These days, his brother was his own worst enemy, being a cock-block all by himself.
So when Sam decided to tell Dean, “Go have fun,” he meant it.
What happened next, Sam never saw coming.