Being Told Led To A Double Cum

In my home, my family all participated with home nudity. When the weather wasn't down around freezing, there was a good chance that we were all running around bare. Our parents enjoyed not being inhibited by any clothes and taught us to feel the same way. We were also taught not to feel ashamed or shy away from our own personal urges. Masturbation was not only accepted, it was downright encouraged on my end, being the only boy of three children. 

One day during the tail end of summer vacation the three of us had our doctor's appointments, and since it was during the week Mom just took the day off from work and stayed with us afterward. We got home and, of course, stripped naked. She made us lunch and while watching TV she suggested we played a board game to pass the time. We set it up on the living room floor and all sat around, including my twin sister and other sister. We played for about 10 minutes or so when I felt one of my many erections start to grow. Nothing unusual there, as they had seen my erect penis hundreds of times by that point. This time, however, it wasn't just a random hard-on. I hadn't cum that day and my teen urges were in overdrive. I tried to just ignore it and let it go away on its own, but it was hell-bent on staying hard. Not only that, but eventually I could feel a little precum flow out and dangle from my head. Mom noticed it as well. "Honey, did you masturbate before we left this morning?"
"No...I didn't have a chance to. I'm fine, I'll do it later."
"No, go down to your room and take care of it. I don't want you leaking on the carpet. We'll wait on you."

My younger sister giggled as I got up and walked away, not just because my penis was bouncing and bobbing back and forth as I moved, but because Mom pretty much announced to everyone I was going to go masturbate. When I got to my room I didn't even close the door, as masturbating was no big deal. Even with that, the one stern rule was masturbating was to be done either in our bedrooms or in the bathroom. Just sitting there and making myself cum in the living room was certainly forbidden. Knowing they were all down the hall, I pulled out the nudie magazine a friend gave me that I had hidden in my closet, sat on the edge of my bed and started going to town. As worked up as I already was, this session wasn't going to take long, and less than 5 minutes had gone by when I started feeling my orgasm building. I set the magazine down and leaned back on my left elbow, quickly stroking my wet penis. Seconds later, my legs straightened out and my toes pointed, I let out a high-pitched grunt and came all over my belly and patch of pubes. Lying there catching my breath with my eyes closed, I kept stroking myself and noticed that I wasn't getting soft at all.

My penis was throbbing and I had butterflies in my tummy as it felt like I was going to cum again. My arm burned as I kept stroking, but I couldn't stop. Even though I had only been masturbating a little over two years at that point, I had never felt anything like this before. Now, on my back with my toes clenched tight, I pumped as fast as my arm could go. It then happened. Without any kind of warning or build-up, my second orgasm suddenly hit, me squirming around on my bed, a glob of cum flying up to my neck. Almost melting into the mattress, I lay there breathing hard, spread out, covered in my cum with my entire groin area tingling. You remember what static on an old TV looked and sounded like? That's how my penis and balls felt at that moment. I'm not sure how long I was there, but I heard mom holler out, "Are you coming back? We're waiting on you!"
"Ok, I'm coming!" I got up and grabbed a couple of tissues from the box, wiping up what I could find. Heading back to the living room, my penis was still feeling warm and heavy, but was now nice and floppy, having cum twice in less than three minutes. I sat down and Mom asked me, "Feel better now?"
I just said, "Yeah, much better."
My twin then said, "I hope so, you were down there long enough."
I scowled at her and mom said, "Now now, leave him alone. A boy his age needs to masturbate often. Besides, let's not pretend that you don't masturbate too, missy." She then blushed and I gave her a sarcastic smile, my younger sister now on her side laughing. "Ok you guys, that's enough. Let's finish the game."

We finished playing and continued watching tv. Dad came home and we had dinner, the evening went on and we all went to bed. I masturbated again that night and even tried to go twice for the second time, but it wasn't happening. I'm not sure how or why I had that second orgasm so fast, but it is probably still the best feeling masturbation session I've ever had.