I noticed the twin’s bedroom door opening slowly and I saw June’s face, or half a face really, appear in the opening. Dad didn’t notice because his view was blocked my Mom’s head. June was a foot to the right of Mom and Dad as they fucked against the wall. Mom was not quiet and Dad was making more grunting noises as their passion increased.
I looked past Dad and Mom and made eye contact with June. I could see a half mouth frown form on her face when she noticed me on the top stair. I didn’t think she could see me jerking off but when she raised her hand to her face and gave me the universal motion for masturbation with her curled fingers going up and down, I knew that she knew, even if she couldn’t actually see. Then June’s face disappeared and Julie’s face took its place. She grinned up at me and jabbed her tongue into her visible cheek and thrust it around symbolizing a blowjob. I smiled down at her.
Dad had been bracing himself with his hands on the wall above Mom’s shoulders as he thrust his hips back and forth. Then he dropped his hands to Mom’s tits. I couldn’t see but it was obvious that the twins could. Their door opened a little wider and full faces of both girls appeared. Julie was on her knees and June looked out over Julie’s head. They could reach out of their door and touch Mom’s tits if they wanted. Considering that Mom was sleepwalking, they could have grabbed Mom’s right tit and she wouldn’t have known. I didn’t know if the girls understood that Mom was sleepwalking or not.
With Dad still pummeling her pussy from behind, Mom turned her face toward Dad’s head on her left shoulder and now she was looking directly at me with that blank look in her eyes. Dad pulled back and grabbed his wet cock as Mom turned further to face him. Then she aggressively pushed him against the opposite wall and followed him, pressing her tits against his chest. She pulled his cock down and lifted one leg into Dad’s hand and pulled herself back on his cock again.
Dad bent down and grabbed her ass cheek with his free hand and lifted her up as she slid her pussy fully onto his cock. I had to come another step down the stairs so I could watch. The twins had opened their door even further and now I could see Julie’s naked tits as she knelt below June’s naked tits. They were both tweaking their erect nipples which were extraordinarily long. That was all I could take and I sat back and furiously stroked my cock and spewed cum into my cupped left hand. When I looked down again, June and Julie were both jerking their curled hands up and down. Julie was grinning up at me. June was not.
Mom groaned hard and violently began humping her pussy onto Dad’s cock. She was in a hard orgasm as Dad groaned hard too and let go of his own orgasm. He held her close to him as they continued to hump on each other before they both slowed to a stop. There was no indication that Mom woke in the middle of all that.
With the action over, the twin’s door quietly shut and I carried my cum-filled hand up to my room and wiped it clean with a wad of tissues before sliding back into bed. The light at the bottom of the stairs went out and I could see the darkened forms of Dad guiding Mom back to their room.