Dean’s always had a thing for lingerie. Dean’s also always had a thing for his brother, so it does make sense that Sam wearing a black bra and black panties is the hottest thing Dean’s ever seen.
Especially when Sam is waiting for him bent over the kitchen table, as Dean comes back from his shift at the local diner, and the first thing that leaves his mouth is, “I prepped myself.”
Dean is rock hard before he even pulls his cock out, and he slides the pretty panties down Sam’s skinny thighs before shoving inside hard.
"The things you do to me, Sammy… I love you so much, baby. Feels so fucking good around my cock…"
"Oh God, Dean… Do you like it?"
Dean almost chokes on an incredulous laugh. “Are you kidding me? I’m about to shoot my load already. It’s- it’s fucking perfect.”
"Fuck, I wanna come too… I’ve been hard all day, just thinking about it. The panties are a mess."
Dean groans, the mental picture of Sam’s dick tenting the tiny panties and leaking inside of them too hot to handle. “Told you you’d like it.”
"Yeah," Sam pants. "Yeah. Maybe next time I’ll wear a skirt, too."
Dean comes so hard that he almost passes out. The kid will kill him, some day.