Luigi jumped at the sound of long, low moan coming from his brother's bedroom which was right next to his. "Bro, are you alright in there?" He asked, but all he received in response was another moan. Luigi stood up and walked out of his bedroom and into his brother's bedroom. His cheeks lit red when he saw Mario fucking himself with a large dildo. "Oh, so good... Ah, Oh, Oh!" Luigi couldn't help but grip his hardened member when he heard his brother let out a high pitched moan, not knowing that the younger was there. "Nnh, ah...! A-Ah! Ah!" Mario moaned Loudly and sped up, his eyes clenched shut. "Mamma mia, Mario...! You didn't tell me you could get a guy this hard...!" Luigi whispered to himself, hiding behind the doorway. He quickly sat down and unbuttoned his pants, pulling out his cock. He began to stroke himself, moaning softly and whimpering at how hard he'd become from watching his own brother. "Of all the nights I choose to stay awake, it had to be this one!" Luigi breathed, thumbing the head if his cock. "Did you enjoy the show?" A lust filled voice asked. Luigi looked up blushing, when he saw his older brother staring down at him, smiling, and completely naked. "If I did?" The younger asked. Mario smirked. "Then I might have to do this!" The older giggled, then sat down in Luigi's lap and lowered himself onto his brother's cock, smashing their lips together. Luigi moaned loudly into the kiss, his eyebrows furrowed as felt his brother begin to ride him. "M-Mario...Oh... Oh, yes..." He breathed, panting and starting to sweat. Luigi smashed his lips back onto Mario's, shoving his tongue into his brother's mouth and earning a moan. A bit later, they both came, but they didn't pull apart. "I Love you, Luigi.." Mario breathed, snuggling into his brother's body. "I... I love you too, Mario..." Luigi whispered, tearing up and gently rubbing his brother's back.