I fingered my friend’s sister while he watched through the keyhole

They sneak into the guest room, hearts pounding with anticipation. The friend, oblivious, sleeps soundly in the next room. Joining her for drinks at the kitchen table, her sister gets flirtatious. Her hands casually brush her thighs, her lips part slightly. With a playful grin, she pulls him onto her lap. His hands explore her curves as she whispers, He’ll never know. On the bed, she arches her back, her moans muffled by his mouth. Their passion is wild, their connection magnetic. The risk of discovery fuels their intensity. He thrusts deeper as she claws the sheets, her eyes locked on the door.