Check on your sibling's actions

You silently open the door and stick your head around the corner. You had expected to get a tantalising glimpse of her moist snatch, before she suddenly covered up and started shouting. It would have been worth it however, you had seen her slinky around in the summer in a tiny bikini, driving you crazy. Once you swore she deliberately walked past you, dropped her sun glasses and bent over at the waist. The back of the bottoms road up her ass, on the verge of exposing herself completely. Just as she was teetering on the brink however, she straightened up.

She had turned to you and smiled though....

You are greated by the sight of her bent forwards on her bed, knees drawn up, ass high in the air. Her pajama bottoms are around her knees. Her hand is reached underneath her, between her legs, and a slim pink vibrator is pistoning in and out of her glistening pussy.