Sisters in secret, they sneak into each other's beds at night, their hands seeking out the soft mounds that have begun to grow. They giggle nervously, their hearts pounding as they touch each other's nipples, feeling them harden under their fingers. Their bodies press together, their breaths coming in short gasps as their excitement builds. They know it's wrong, but the sensation is too delicious to stop, their fingers circling and pinching, their bodies writhing together in a dance of forbidden desire.