I had been on my knees kissing the cute patent knee boots I'd just bought my daughter Sally whilst she leafed through some of my female domination magazines when she'd suddenly gasped "Daddy, what's that...?!"

I stopped kissing and looked at where she was pointing in the magazine. The picture showed a dominant woman standing behind a man who was bent over a bench and from her crotch was sprouting a huge strap-on dildo.

I smiled, "what does it look like, sweetie?"

"It looks like she's got a big penis, but she's a woman!"

"It's what's called a strap-on", I told her.

"What does that mean?"

"Well, it is like a penis, but, of course, it's not real, it's made from rubber or a type of plastic, but it's called that because, as you can see, it's fastened to her with straps."

"But what's it for? She can't use it on him, he doesn't have a vagina."

"No, that's true, but the vagina isn't the only place you can put things and some men like women to put things up their bottom."

"Eww!" she exclaimed.

"I might remind you," I said teasingly, "that you liked it when I washed you in the shower this morning and popped my finger inside your bottom. And remember that you did the same to me too and I certainly liked it as well."

"I suppose so, but that's much bigger than a finger!"

"True, but she wouldn't use something like that if he wasn't used to it. He probably started with fingers or, well there's something called a butt plug. Hang on, let me show you." I went over to the case which held the sex toys and other equipment which my late wife and I had used and took out a small plug.

"Now you see this is much smaller than what she has there, isn't it? Oh, by the way, don't worry, this was well washed after the last time it was used. See that it's made from smooth, soft plastic and it's shaped so it will slip easily into someone's bottom, but this wide base stops it from getting stuck inside."

"Wait a minute. You said that this was stuff that you and mummy used. Did you put this into her?"

"Sometimes, yes. But usually it went inside me instead."

"You like things up your bottom like that?"

"Sure, it feels very nice if you do it carefully and gently."

She looked at me sceptically but said "and did mummy ever put anything like that strap-on thingy in you?"

I smiled and reached into the case. "You mean like this one?" I said, pulling out my wife's dildo harness.

Sally reached out and put her hand around the rubber phallus. "It's not as big as the one in that picture, is it?"

"No, but he's probably had more practice than I have. And I still liked it when your mummy put it into me."

She thought about this for a while and then to my surprise said "Ok, so do you want me to put it into you?"

"Oh sweetie!" I cried in delight, "yes, please, I would LOVE you to put it into me!"

"Alright, but I want you to put that one into me," she said, pointing to the small plug.

I was astonished, but said "If you want me to, of course I will. This one is nice and small, so it should go in without hurting you. Tell you what, let me take off your blouse and skirt, but I'd love you to keep your boots on."

Quickly I undressed her, then said "Right, I think it would be best if you knelt on the bed on your hands and knees." She did as I suggested and I admired the sight of her cute little butt sticking up in the air. I couldn't resist the temptation and gave it a couple of gentle smacks.

"Ow!" she protested, putting her hands back. "Did that hurt, honey?" I asked. "Well, no, I suppose not, but you might have said," she pouted.

"Ok, next time I'll ask first. But now I'm going to put some of this on you," I said holding up a tube. "This is called Lube, short for lubricant, it's slippery and makes things much more comfortable when I put the plug into your bottom. If this starts to hurt at all, just say so and I'll stop"

I took out a latex glove and put it on, then squeezed a small amount onto my finger and placed it on her tight puckered anus.

"Ooh! That's cold! She squealed.

"Don't worry, it's only chilly for a moment, just relax."

I worked my finger around the outside of the opening, then gently pushed the tip inside. Sally made a slight whimpering sound and for a moment squeezed my fingertip, but then relaxed and let me push it in a bit deeper.

"Oh, daddy, that feels funny!"

"Bad funny?"

"No, just weird, but it's alright.

"Good, now let me put some more on. By the way, it may help it feel even nicer if you rub yourself between your legs."

I added more lube and worked it a little bit deeper, slowly, a fraction at a time. Sally was wriggling and whimpering, but didn't complain and certainly wasn't trying to stop me and her little hand was working away rubbing over her sweet little pussy.

"Right, that's enough lube on you, so now I'm going to put some on the plug and put it inside you. Remember, if this hurts at all at any time, just say so and I'll stop."

"Ok, daddy."

Gently I took the plug and put the tip against her sweet little bum hole. Gradually I pushed it in, a couple of millimetres at a time, giving her time to get used to the sensation, then withdrawing it slowly before pushing it in a bit further. Her hips and bum were bucking and wiggling about and her hand was still rubbing at her pussy lips as I carefully and slowly slid the plug in.

When it got to the widest section, Sally gasped for a moment.

"Are you ok, honey? Do you want me to stop?"

"Just for a moment, please, daddy."

"Ok, but this is the widest part, once this is in it gets a bit thinner."

"Umm, alright, go on then."

I slowly but firmly pressed on the end of the plug and with a little resistance and a small gasp from Sally, the widest part popped through the sphincter and there was no further difficulty in getting the rest of it inside so the flanged base was between her bum cheeks.

"How does that feel, sweetie?"

"Oooh, it's weird," she said, waggling her hips. "It sort of feels like I've got to do a really big pooh, but not quite."

"That's good," now I'll let you have a moment to get used to it and then it's daddy's turn.