After that, it'd just be you and her."
I looked at Donna, and she simply said "You said we needed to think about what we wanted, and all that, so I thought that if we did things that way, then we could all find out what we wanted to know — but not too much."
I looked at each of them for a moment, and not one of them appeared to be nervous or afraid or embarrassed — only a trifle worried that they'd picked a bad time, nothing more.
I smiled before telling them "That's fine; that's exactly the kind of thing that I want you to do -
think about what you want, and figure out how to make it happen while you help each other."
All three looked pleased as I asked them "I'm guessing you wanted it to happen now?" They nodded, and I next wanted to know "Did you want it to be down here, or someplace else?"
It was Karen that told me "We thought down here, for this. Your bed is bigger, so there would be room for all of us."
"Okay, that's fine. What did you need or want me to do?"
Wendy gestured with the book in her hand as she told me "Um, just for you to be naked at first, so we can see how real people are different than the book Mom had us all read."
To that, Donna added "We think we'll have questions, too. And… and if it's okay, we'd like to do more than just look."
"That's okay, too.", I told them.
All of us just stood there for a couple of seconds, before I realized that they needed me to get things moving. After standing up, I walked to where my queen-size bed was; the three of them followed, and silently watched as I started to get undressed. I was curious as to when (or if, in the cases of Wendy and Karen) they would get undressed to — and was mildly disappointed when none of them followed my example. They didn't need to, of course, but I would have enjoyed the view if they had.
The only noise came when I slid my shorts down, and my cock and balls slipped free — causing Wendy to gasp. Once I was naked, I calmly got onto the bed and lay down on my back so that I was as passive and non-threatening as I could be. It took a few seconds for them to get started, but all of them were soon sitting on the bed even with my thighs, facing me. Wendy opened the book where one of them had put a bookmark, then set it to where all of them could look at it. For the next several minutes, I understood how a bug under a microscope must feel as all three of them gestured between me and the book as they exchanged whispers. Once all of them were satisfied that what was in the book was a reasonable approximation of the real world, it was Wendy that asked "Why are you different here at the end, than the book? It shows something they call a 'foreskin', but you don't have one."
I carefully explained to them that I did, in fact, have a foreskin — but that it looked different because I'd been circumcised (and what that involved). They were wide-eyed by the time I was done, and I had to go on to explain to them that it had happened while I was still an infant, and that I had no memory of the experience… which visibly relieved them.
A few more questions followed, and I didn't have any problem answering to their satisfaction.
After they'd all sat there silently for several seconds, I thought to ask "You want to look closer, and touch?"
With faint blushes, all three nodded their heads, and I told them "Go ahead, then, if you want. I'll let you know if you start to do anything that hurts, but otherwise, I'll just stay quiet."
Though my expression never changed, and I stayed quiet and impassive, I was considerably amused when the first thing each of them did was to run her fingertips through my pubic hair, above my penis. They must have spent nearly two full minutes just marvelling at how different it was from their own growths before Karen tentatively took my flaccid penis between two of her fingers and lifted it up from where it was laying on top of my scrotum.
When I didn't have any visible reaction, Wendy and Donna then began their own investigations.
After that, the next few minutes went by with all three of them fascinated by the particulars they found. With all three of them dressed, and me again feeling like a particularly interesting biology specimen, having their soft hands on my equipment wasn't exactly stimulating for me. I knew that Phase One of the program was over when Wendy closed the book she'd brought along, then moved up to give me a kiss on the cheek (and get one back, along with a pat on her butt) before she told me "Thanks, Uncle Ted.", and smiling when I answered "You're welcome, honey."
After Wendy had been gone for several seconds, Donna and Karen shared a brief look before both of them got off my bed and began undressing. Once naked, they got themselves situated next to me again, one on each side. Apologetically, Karen told me "I… I want to see what happens when you get excited, but I don't think I'm ready to, um, do anything with you yet."
I quickly assured her "That's fine, sweetheart. I don't want you to ever do anything you're not ready for, okay? I will never, ever be mad or upset if you want to wait and make sure before you do something."
I could see that my words had the desired effect when she smiled, and nodded her understanding.
Donna then asked me "What should I do, Uncle Ted? To get you excited?"
I looked at her, and calmly answered "What you should do is only what you want to. What you can do is try doing to me what I do to you."
"But you're a guy, and you're not the same as me!"
"No, but a lot of what works on girls will work on guys, too. Sure, all our parts are on the outside, but that really just means that it's easier for someone to get us excited. Instead of a small clitoris like you have, I've got the head of my penis, which is pretty easy to find" — that drew a laugh from both of them — "and has the same effect on me. Instead of the pretty flower petals that you have" — both gave me pleased smiles at my description — "there's the shaft of my penis." Then, sounding like a TV ad announcer, I added "But wait! There's more!", making them laugh again before I finished "There's also my testicles, inside my scrotum. They aren't as sensitive, but if you touch them and gently play with them, that helps, too. And pretty much every guy is going to be easier to get excited if he can touch you, too."
Smiling, both of them scooted themselves close enough that I could reach them; then Donna reached out and took my cock in her hand as I put a hand on each of their cute little asses. Donna seemed uncertain what to do once she had hold of me, so I started caressing her smooth, firm ass cheek; a second later, she began stroking me.
It took a couple of minutes before she began to get the kind of reaction she wanted; once she did, though, it didn't take her long to increase and expand her efforts. She wasn't hurting me, so I was perfectly willing to let her learn what to do, and how, on her own. Besides, it gave me time to enjoy playing with both of their lovely tushes. Once I was almost fully erect, I heard Karen's incredulous voice say "It… it's so big! I didn't know they could get like that!"
Calmly, I told them "Believe it or not, that's about the normal size for men. I'm about as average as I can be — some are smaller than me, and some are bigger. It's a lot like girls and how big their breasts are — I'll bet you two aren't much different than most of the girls your ages, but that there are some that are really small, and some that are really large; but most of you are pretty close to the same."
I saw as both of them silently nodded in agreement as Donna continued her efforts. A little later, Donna managed to convince her sister to try it for a bit; the first thing Karen said after wrapping her hand around my turgid manhood was "It feels so warm! And it's so soft on the outside, but still so hard…"