Luigi, left alone in the Mushroom Kingdom, indulges in a private moment, his hand eagerly stroking his hard cock. Mario, returning unexpectedly, catches his brother in the act and, fueled by jealousy and lust, pins Luigi down. Mario's massive cock, already hard from watching Luigi, slides into Luigi's tight ass, making him gasp. Mario fucks Luigi hard, slapping his ass and grunting with pleasure. Luigi, despite his initial surprise, moans in ecstasy as Mario's cock hits his prostate. The room fills with the sounds of their bodies slapping together and their moans of pleasure.