Again keeping my eyes closed, I answered "Not by myself — not like this. But if you want to help me, it'll happen."
"What do we need to do?", Eva wanted to know.
That question had me spending the next few minutes talking them through the process of how to start masturbating me. When they began to get the desired results, I caution them about what could happen
— both if they took it all the way to the end, and how it would feel for me if they went too far without finishing things. Both expressed their understanding, and I left them to it; what they were doing wasn't painful, but it wasn't particularly stimulating, either. As they went along, their questions gradually became more and more direct and explicit: "What happens when you have a climax?", "How can you tell when you're getting ready to squirt your stuff?", "How long can you stay hard?", "How many climaxes can you have?", and so on. I answered as best I could (knowing that they could see me blushing at times), and tried to correct any mistakes they made or misinformation they had. A few times, it was necessary to give them a somewhat lengthy explanation to make sure they understood what I was telling them.
While all of that was happening, they were also asking me if they were doing things right, what else they could do, and such. They seemed to pay attention to the feedback I gave them, because their handjob skills slowly but steadily improved. They got good enough at pleasing me, in fact, that I found it prudent to tell them "What you're doing feels real good, now. But if you keep going and don't let me finish, it's going to be really uncomfortable for me, like I told you. It's what us guys call 'blue balls', when we get aroused like this for too long and don't have a climax."
The only response that comment/reminder drew from them was a simple "Okay" from Eva; neither one of them stopped what they were doing (or even slowed down, that I could notice). I could only conclude that I was destined to either receive my first-ever handjob from my sister and her friend, or one Hell of a set of aching balls. I was hoping and praying that it was going to be the first of those two choices.
I couldn't resist cracking my eyes open a little, and saw that both my sister and Charlene were absolutely fascinated with my erect cock. One of them would slowly and softly stroke me while the other gently caressed my balls, then they'd swap for a little while before changing back again. It was an exquisite kind of torture to have them slowly and steadily move me closer and closer to cumming. I could also see that there were two pairs of very erect nipples to testify to the fact that they were enjoying what they were doing, too. While keeping my eyes narrowed to mere slits, I took a slow, deep breath — and realized that there was a distinct aroma in the air; young and inexperienced as I was, it took a few moments for me to realize that it was coming from Eva and Charlene… and what it must be.
That understanding got me even more aroused until I saw the end of Charlene's miniature penis sticking up. I nearly lost my thrill at that point until I remembered what Charlene had said about her arousal affecting both sets of her genitalia and that it had never gotten completely hard before; I figured that if that was the first time her penis had ever stood up like that, then it had to mean that she was far more excited than she'd ever been.
Knowing that Charlene was that aroused, it seemed likely that Eva was pretty worked up, too The idea that my own sister was getting hot from playing with my dick got into my head, and it was less than a minute later that I had to tell them "I'm going to cum!"
Whichever one of them had her hand on my erection didn't slack off in the slightest, and only a few more seconds passed before I was trying to coat the ceiling in Evas room with my semen. I didn't actually spray my cum that far, but from the gasps I heard from both of them, I can only figure I made a damn good job of trying.
My cock was pointed nearly straight up, so the first was of my jizz landed just a little below my navel; the ones after that hit progressively closer to the source. The last couple of spurts simply leaked out the end and coated my slowly-shrinking penis and the soft hand that continued to stroke me. Only then did I open my eyes and look down to see that it had been Charlene that had finished me off to Sis' rapt attention. I realized that neither of them was paying the slightest attention to the rest of me when I saw Eva, then Charlene, reach out and collect a blob of my cum on the end of one finger. Both ran it between thumb and finger to check its feel and consistency before hesitantly touching a tongue to it.
Charlene appeared to be fairly indifferent to the experience, but I could see that Eva found the taste of semen to be more than a little pleasant. Only when they heard me take a breath in preparation for talking to them did they turn their heads toward mine, blushing furiously. Taking pity on them, I pretended that I hadn't seen what they'd done and simply told them "That felt really good… what both of you were doing. I want to make you two feel like that, too, when it's my turn."
Each of them looked pleased at my assurance, and both eager and intrigued by my expressed desire please them. After several seconds, it was Charlene that asked "Does… does your stuff always shoot out like that? That hard, I mean?"
"Not usually. That time, it was stronger than most because of how good you were making me feel and how excited I was", I answered.
Then Eva wanted to know "Is there always that much of your juice?"
After looking down to where it was puddling on my belly first, I told her "If it's the first time I've had a climax for a while, yeah, pretty close. If I had another one tonight, it wouldn't be as much or as thick as this time — a guy's body only holds so much of it, and it takes a while for him to make more of it, too."
Eva followed her question with another: "Um… how long would it take before you could climax again?"
From the expression on her face and the tone she used, I knew she wanted me to cum again, and I somehow managed to keep myself from smiling as I answered "If I just waited, I'd probably start to get hard again in an hour or two." To the forlorn expression she started to get, I continued "But if something was to happen to help me, it could be anywhere from fifteen or twenty minutes to half an hour before I could start to get hard", something that had her perking up considerably. I hastened to add
"Either way, it'd take a while before I could climax, unless I got even more help."
That was when Charlene spoke up again, saying "Billy, if you want to stay here, I'll go get something to clean you off with. There's some other stuff I want to ask you, and since I'm getting a little sticky, I figure you are, too."
I just smiled at her and said "I wouldn't have any problem cleaning myself off, but if you want to do it, that's fine."
With that, both of them got off Eva's bed and headed for the bathroom. Since Charlene was going to wipe me off, I just stayed where I was until they were back several minutes later. As long as they were gone, I knew they'd taken the time to talk about what me, them, and what had happened at least a little bit. True to her word, Charlene had a washcloth and face towel in her hands, and as soon as she was seated on the bed she went about wiping up my cum — not just from my belly, but out of my pubic hair and getting my softened penis cleaned off and dried. When she was done, she wrapped the barely damp washcloth in the towel and set them aside. I was surprised to discover that having my sister and her friend both able to see my drastically shrunken penis didn't bother me as much as it would have before; whether that was because of all of us apparently used to being naked together or from them already having seen me fully erect (and climaxing), I didn't know… and didn't particularly care.