I was a nineteen year old sophomore in college, still living a home when my sister and her best friend decided on having a sleepover. I ogled these 18 year high school seniors in their nightclothes and it wasn't long before I had to retire to my room because my anatomy was betraying me.
As I lay on my bed with shorts and no shirt I again was thinking that the girls were hot looking and I had the starting of an erection. I ran my hand under the waistband of my shorts and felt the head of my now almost fully erect cock. I started to feel around the head and I closed my eyes enjoying the sensation, when my door flew open and I heard giggling. God was I embarrassed!
My sister was the first to speak, "Oh gosh I'm sorry, I didn't mean to barge in without knocking." I released my hard cock and removed my hand from inside my shorts but the bulge was as evident as ever and as I looked up I could see both my sister and her friend looking directly at my half exposed cock.
"I never expected to see your penis, and not hard like this", my sister was quivering and she could not seem to remove her eyes from where my dick lay up against my belly. Her friend Robin was also staring and as I looked up at her I noticed she had one hand stroking her left breast and the other between her legs.
For the first time since they both entered the room Robin spoke, "Can I touch it?" Looking at my sister I noticed her nodding her head and Robin was not talking to her. I said, "Sis are you OK?"
Without speaking my sister walked toward the bed reached out and pulled my shorts down and wrapped her hand around the base of my cock and started stroking lightly. She looked up at Robin and motioned her over to the bed.
"Go on Robin touch his balls." Robin sat on the other edge of the bed and reached her little hand out and lightly cupped my hanging sack. In the mean time my sister was stroking me faster; I reached up under her nightgown and laid my hand on her thigh. Unconsciously her legs spread and as I started to creep my hand closer to her pussy I could hear her breathing coming in rapid gasps.