"It's for verification purposes only," the siblings repeat to themselves, trying to justify their actions. They stand naked, their bodies barely an inch apart, their hearts pounding with a mix of fear and excitement. Michelle, the elder, reaches out first, her fingers brushing against her brother's cock. He jerks slightly, his own hand moving to cup her breasts. They explore each other, their touches tentative at first, then more urgent. Michelle guides her brother's fingers inside her, showing him how to touch her, how to make her moan. He learns quickly, his fingers moving in and out of her, his thumb rubbing her clit. Meanwhile, Michelle strokes his cock, feeling it grow harder in her hand. They continue their forbidden dance, their bodies moving in sync, their breaths coming in short gasps, until they both reach their climax, their bodies shuddering in release.