I wasn’t worried when Dad sat me down for a chat. Seeing as it was just him and me, and I was a bit of a naughty girl, it happened quite often. Dad was always calm and patient with me and we always worked it out in the end. This one time, when I was about ten, it was a bit different though: it wasn’t about me.

“Honey, how would you feel if I was to go out, you know, with a woman?” I was surprised and I didn’t think that I liked the idea of him being with someone who wasn’t me ... or Mommy, but I felt a bit selfish for feeling that way. Then I had a thought that I didn’t like at all.

“Are you going to marry her?” I asked, feeling a bit panicked.

“No, Alex, sweetheart,” he said, chuckling and gently stroking my face. “We’re just, you know ... friends.” That seemed OK. I had boy friends (not boyfriends!) at school and that was fine.

“That’s OK then,” I told him, and we had a little cuddle.

There was a lovely girl called Candice who used to babysit me while he was out, who was very nice and lots of fun. After that he used to go out regularly, maybe once or twice a month. He never really talked about it, and he never brought any of his lady friends home, until years later, and Shania.

The first time I met her, the first thing that struck me was how young she was - she could almost be mistaken for my big sister, especially as we both had long blonde hair. She looked about eighteen to me, but I found out later that she was twenty, but that was still only five years older than I was.

At first, I wasn’t sure how I felt about her. It seemed like she would get between me and my dad, and I didn’t want her trying to take Mom’s place. On the other hand, she did seem to make him happy.

To begin with, she just stayed for dinner and they had a few more glasses of wine afterwards. She even suggested that I should try a little. Dad wasn’t so sure, and in the end I had a glass mixed 50/50 with water. I didn’t actually like it that much but I thought it was very cool of her anyway.

When she stayed over the first time I don’t think I was supposed to know, but I ran into her in the corridor the next morning, wearing the same clothes as the night before and carrying her shoes. We both thought that it was pretty funny and she often spent the night after that.

I did like her, but I felt a bit awkward when she was around. They never said anything, but it was pretty obvious that they found it hard to keep their hands off each other. I guess I found it cute, and I was definitely fascinated by the noises that I sometimes heard as I passed Dad’s door.

I suppose that I was a bit confused sexually at the time. I was aware of how sex worked, and I’d regularly touch myself in bed at night, loving the sensations and dreaming of ... That was the problem right there: there were boys and girls at school who I had a bit of a crush on. And a few friends of friends. And even Shania ... sometimes.

One Saturday night, I had to get up to go to the bathroom, and I saw that Dad’s bedroom door was open and there was no light on inside. On the way back it was still open and I peeked inside. There was nobody there but I could hear giggling coming in through the open window. Curious, I crept forward and looked out.

What I saw literally took my breath away: they were in the hot tub and they were both naked! They were standing up and kissing, their hands all over each other. Shania had her back to me and Dad was fondling her butt cheeks.

I was so, so excited! They were very beautiful, and it was so hot! My hand crept between my legs and I began to touch myself as I watched them, rubbing my fingers up and down the front of my panties.

Then Dad put his hands on her waist, picked her up, and sat her down on the little ledge that ran around the back of the tub. I could see Dad’s ass and it was really firm and amazing. Then I noticed her boobs and saw that they were no bigger than mine - she must wear a padded bra, I thought with a wicked kind of glee. And then he pulled her legs apart and put his face between them! Oh! My! God! He was licking her pussy!! I pushed my hand down into my panties and began to stroke my lips properly and they were really wet!

I tried to imagine how gorgeous it must feel to have a soft, wet tongue licking your lips ... and in between ... and the bump at the top!! Suddenly my mind was full of visions of my dad doing that to me! It was the first time that I’d ever thought about him that way, and I’d never felt so excited.

He must have been doing all those things to her because her head was thrown back and I could see her biting her lips as she ran her fingers through his hair. I could even hear the faint little gasps and squeaks she was making. I had the tip of my finger inside myself at that point and it felt so, so heavenly. I’d done it before, of course, but I’d never been so wet before, and it made it so much better!

Then Shania started to thrash about and I could clearly hear her squeals of joy and see the look of sheer ecstasy on her face - OMG she was having an orgasm! Obviously, I knew about them, but I’d never actually had one, and I couldn’t take my eyes off her. God, I’d never seen anyone look so happy!

It was all so incredibly exciting and it felt like I was getting closer and closer to maybe having an orgasm myself ... and then she opened her eyes and seemed to look straight at me!! I froze, praying that she couldn’t see me, my finger stationary in my pussy. For what seemed like forever, but was probably only a few seconds, we just stared at each other. Then she grinned and winked at me! Fuck! She had seen me! My heart was pounding as I ran back to my room. I lay in bed, with the covers up around my chin, waiting for Dad to come in and ball me out.

Gradually my heart slowed as he kept not coming, and the fear was replaced by a dawning realization: Shania hadn’t minded. She’d even seemed to like it! Maybe she hadn’t told Dad at all?

I must have drifted off to sleep with those thoughts in my mind, and with just a faint tingling in my pussy that I quieted by putting my hand between my legs and crossing them around it.

Nobody said anything at breakfast, although I thought I saw a tiny smile at the edges of Shania’s mouth a couple of times when I caught her looking at me.

After breakfast, I went up to my room and a few minutes later, as I was still sitting on my bed deciding what to wear, there was a soft knock on the door. “It’s me, Shania,” she said. I felt my stomach lurch.

“Come in,” I called back nervously. She opened the door and poked her head through the gap. She was smiling and I allowed myself to relax a bit.

“Good time for a little chat?” she asked.

“Sure,” I replied. She came and sat next to me on the bed. Right next to me.

“It’s about last night...” she began. Oh dear, I thought. I’d kind of hoped she might just let it go.

“I’m sorry,” I told her. She took my hand in both of hers.

“Please don’t be,” she said, looking into my eyes and still smiling. “I don’t mind at all. It’s perfectly natural to be curious at your age.” I breathed a sigh of relief and managed a small smile of my own. She began to stand up and then sat down again. “I’m going to suggest to your dad that we play in the hot tub again tonight,” she said, and then kissed me softly on the lips and left.

I was trembling as I sat there, both from the kiss and from the idea that Shania wanted me to watch them again! She’d never actually said whether she’d told Dad or not. Did he know? It was exciting enough that Shania wanted me to watch them, but if Dad did too...?!

For the rest of the day, I could think of little else. I kept looking at Dad to see if he was looking at me differently but, as far as I could tell, he wasn’t.

When evening finally came around, I couldn’t wait to go to bed. I think Shania could tell how wound up I was because she kept grinning at me when Dad wasn’t looking. Eventually, it was my bedtime and I said goodnight to Dad and gave him a kiss. Then I looked at Shania. She kept her expression neutral and I wasn’t sure what to do. In the end, I wished her a goodnight as well and gave her a little kiss too. When I turned around Dad looked so happy it seemed for all the world like he might burst. I scampered up to my room before anyone could say anything, and lay on my bed, quivering with excitement.

I heard them come upstairs, go into Dad’s room, and then go down again. I got up and got undressed ready for bed. I pulled my nighty over my head and then thought about the night before ... and what I hoped might happen tonight. I felt like such a naughty little girl as I slipped my panties off!

As before, their door was open and the light off. I went over to the window and looked out. They were standing in the tub naked and kissing again. Dad had his back to me, and Shania was looking up at the window over his shoulder. As soon as she saw me she grinned. And then she pushed Dad away a little and turned him around. I could see their bodies pressed together, her little breasts squashed against his manly chest and between them ... I couldn’t quite see ... Then she pushed him a little further away and I could see it. His penis! It was pointing almost straight up, and it was so hard ... and long ... and thick!

Fuck! I couldn’t believe it! I was looking at my Dad’s hard-on! I wasn’t even aware of moving my hand until I felt my fingers nudging at the entrance to my pussy. I was wet again and my finger slid inside really easily.

I watched in amazement as she wrapped her hand around his erection and began to rub it up and down. I was so turned on that I began to stroke my own breasts through my nighty, rubbing my hard nipples while I plunged my finger in and out of my now very wet hole.

My mind was going crazy: I was watching her masturbate my father while I was fingering my pussy! I’d never been so excited!

She glanced up and grinned wickedly. ‘Show me’ she mouthed. Oh God, she wanted to see me! It was so thrilling that I didn’t even think about it, I just peeled my nighty off over my head and carried right on where I left off.

She blew me a kiss and watched me play with my boobs for a bit before she dropped to her knees. She was kissing my dad’s cock! Licking it! A second finger joined the first and I moaned out loud at the delicious stretching sensation. This was it! I knew it! The wonderful pressure just grew and grew inside me. It was so close! It seemed like I could only take a breath once every few minutes and even then it was a shuddering squeaking gasp.

And then she took her mouth off him and her hand on his shaft went faster and she cupped his balls with the other and I could see stars in front of my eyes and he spurted white stuff into her mouth and I was so close ... I was so agonizingly close ... but it just wouldn’t happen! Shania looked up at me, the tip of Daddy’s cock between her lips, her cheeks hollow from the way she was sucking on him.

Even though I could have cried from frustration, it was still the most excited that I’d ever been, and I was very grateful to her. I blew her a kiss and outraged myself by pushing my boobs out of the open window and fondling them for her to see.

She took her mouth from him and I could see her lips form the word, ‘beautiful’ before my courage failed me and I ran back to my room on very wobbly legs.

The next day she took me shopping while Daddy had some work to do. In the car, she just whispered conspiratorially to me, “That was fun last night, wasn’t it?”

I felt my face burning, but I nodded.

The clothes that she bought me were much sexier than anything that Daddy had let me get away with, even some crop tops and short skater skirts. Trying stuff on was so hot: I was sure that she loved it when I got undressed as much as I did! She even bought me some new underwear, pretty high-cut panties, not quite thongs, but not far off.

At the checkout, there was a nice lady who said to Shania how lovely her little sister would look in her new things. We couldn’t stop giggling for ages, hugging each other as we walked around the mall.

When we got home I tried a few of the outfits on for Dad. He seemed strangely quiet, but he said that I looked pretty, so I spent the rest of the day in a crop top and skater skirt. I felt so sexy in my revealing new clothes and underwear. I was sure that Dad kept looking, and I loved it. But then I thought that Shania was looking as well, and I loved that too.

By the time I went up to bed, I was already tingling with excitement. Shania had told me earlier that they were going to play in the hot tub again and promised me something special, and I couldn’t wait!

I peeked out of Dad’s window, and I admit I was a little disappointed by what I saw: they were sitting side-by-side and all I could see was Shania’s breasts. They were lovely, but not really something special. Then she saw me and grinned before reaching back and pulling something out from under a towel. At first, I wasn’t sure what it was, and then she got him to turn slightly and put it over his head. It was a blindfold!

She settled it in place, waved her hand in front of his face and then she gesticulated for me to come down! Oh! My! God! I was going to go down there with them! I could hardly breathe and just stared at her as she did something under the water that I couldn’t see because of the bubbles. Whatever it was Dad liked it a lot. She looked back up and saw me still there. ‘Come down’ she mouthed, gesturing again.