A green-haired brother and sister, lost in the virtual reality of Roblox, discover a hidden hentai dimension. With a mischievous grin, the brother activates the mod, transforming their avatars into explicit, detailed versions of themselves. Their sister's initial shock quickly turns into curiosity as she watches her brother's avatar grow a massive, throbbing cock. Unable to resist, she reaches out, touching the digital phallus, feeling the familiar yet foreign sensation. Their bodies intertwine, their avatars fucking with wild abandon, the brother's corny lines echoing in the virtual space as they explore the boundaries of their newfound fetish.