A two way mirror

Joe and Clair rushed into their room and turned off the main lights, leaving just bedside lights on. They moved quickly over to their small ensuite bathroom and again turned off the lights before Joe carefully removed the bathroom mirror from the wall.

As the mirror came away, they saw the empty guest bedroom, with Helen's suitcase open on the floor. They stayed quiet and still. After testing it out, they knew that they would be invisible from the guest room - it would look just like a mirror from that side - but that too much noise would still travel easily through to the other room. It had taken Joe a couple of days to get the special glass fitted, but the results were perfect and would allow them to see pretty much the entirety of the guest room.

The anticipation had them on edge, standing close together but not touching. Then they heard the flush of the toilet in the other bathroom, and Helen entered the guest bedroom. She walked over to her case and rummaged through it, eventually pulling out a book and a nightgown. As they looked at her, the excitement of observing her without her knowledge began to get to both Clair and Joe. Clair began first, her hands cupping her breasts. Pulling her clothes off, she returned to her breasts, teasing the nipples with her fingertips. Joe had pulled his clothes off as well, and was stroking his hard cock as he watched his sister-in-law begin to take off her top.

As Helen's top hit the floor, shortly follow by her skirt, Joe had reached a quick rhythm, and Clair's hands had found their way to her wet pussy. This view of her unknowing sister was such a turn on to Clair, she found her cunt dripping with her juices and her clit begging for attention.

Clair paused a moment, looking in the mirror, before reaching behind her and unfastening her bra and then pushing her panties down her legs. As her large tits sprang free, Joe struggled to supress a moan of excitement. Clair stepped in closer to him and one finger pressed against his lips in a gesture of quiet, whilst the other found his cock. Joe tasted her arousal on her finger and felt her hand replace his in it's quick stroking.

Husband and wife watched Helen and admired her full figure as she reached for her nightgown. Her large tits were full and pert, her curvy body inviting and between her legs a small patch of dark hair promised much. Joe's fingers trailed up Clair's thigh and found her hungry slit.

The pair touched each other passionately, as Helen's nightgown slid down and hid her body from their view. As she got into bed, Clair and Joe had to decide how to finish off their excited bodies.