You should definitely read "A Night Of Incest" prior to reading this story. This is what happened the next morning.
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I was only half awake the next morning but could hear my twin brother up and moving around, getting a quick shower and dressing. From the open bathroom door I could hear his oh so familiar groan over the falling water. This told me he had been jerking off and had just cum -- part of his morning routine if I wasn't around to blow him. Through bleary eyes half open I enjoyed seeing his naked body as he dried from the shower. My mouth still had the aftertaste of cum in it -- both his and our dad's -- all in one night. If I had been more awake I certainly would have taken that nice cock of his in my mouth until he filled it with another load of cum. As I drifted back to sleep I remembered that he and my dad were going to play tennis this morning.
Sometime later I awoke. I uncovered myself and saw that I had my usual morning hardon. I thought to myself that, like my brother Steve, I would jerk off in the shower. I certainly had plenty of images in my mind from the previous night. Sucking my twin brother's cock in front of my parents and then having my mom jerk my dad off into my mouth. I think I could get off reliving that. I stepped into the bathroom that adjoined the bedroom my brother and I shared. I left the door open as we usually do and started the water for my shower. I could feel my erection growing even firmer as I thought about possibly sucking both my brother and my dad's dicks together. As I leaned back wetting my hair I heard: "Hi honey, how are you doing this morning?" It was my mom who had entered the bathroom and was now standing right in front of the transparent shower door and taking in every bit of my body and my cock standing at attention. She was wearing a night gown. Although it was not particularly sexy it clung to her body nicely, making it clear there was nothing underneath.
"Oh, I'm good." I said enjoying having my mother looking at my cock again.
"I just wanted to check and make sure that you are OK with what happened last night? Do you...uh...have any regrets or guilt or anything like that?" she asked.
"No, I thought it was fun. Are you OK with it?" I answered.
"Yes, I enjoyed it also. What did you like about last night?"
The setting and the conversation was really exciting me at this point and gave me some courage. "Well, I enjoyed having you and Dad see me naked and watch me suck Steve's dick and it was very hot having you stroke Dad off into my mouth. I can still taste them both in my mouth. Oh, and I also liked seeing you naked."
My mom smiled broadly at this and said: "I liked all that too. And I'm enjoying seeing you naked right now. I always wondered if you and your brother played with one another. You are definitely your father's son."
She noticed the slightly confused look on my face and said: "Your dad likes men from time to time too and I have always loved watching him. And I certainly enjoyed seeing what you did with Steve last night -- that was quite a show. Do you do things with any other boys?"