Make the gap wider

You slowly push the door open, widening the gap. From this angle, you can just see Caitlyn lying on the bed, her legs spread wide. She's alone.

She is wearing a satin and lace cami with mathcing satin shorts. Her both hands are tucked inside the shorts.

You hear Caitlyn's breathing become more ragged and shallow, accompanied by soft, needy whimpers. "Oh... ohhhh... yeah... m...mmm. Moo. Mom, you... you're so... se...sexy," she moans, her voice trembling with desire.

You feel your own breath catch in your throat as you listen to Caitlyn's desperate pleas. Your cock twitches and strains against the fabric of your pants, the damp spot at the front growing larger with each passing second.

Caitlyn's hips buck and grind against the satin sheets of the bed, her movements becoming more frantic and uncontrolled.

You are transfixed by the erotic sight of your sister, Caitlyn, pleasuring herself on the bed. Her satin shorts are hiked up around her hips, revealing the tantalizing legs. The lacy cami clings to her breasts, the sheer fabric leaving nothing to the imagination.