Natsumi arches his back, moaning loudly as he feels the familiar sensation of orgasm building up inside him. He digs his fingers into Naoto's shoulders, urging him to go faster, harder. "I'm close," he gasps out between breaths, "Don't stop." The feeling of being filled by his brother is overwhelmingly pleasurable, and as they continue to fuck, Natsumi can feel the familiar pressure building up inside him, threatening to release in a torrent of hot cum.

Natsumi feels his orgasm cresting, and with a loud cry of release, he comes hard inside his brother, feeling the warmth of their mixed seed pulsing between them. His body convulses as wave after wave of pleasure washes over him, and he collapses onto Naoto's chest, panting heavily.