I knew about Mom’s little sister, Mandy, but the last time I’d met her was when I was about eight. She was three years younger than Mom and all I remembered was that she looked a lot like her but she was more ... fun.

She’d been married twice, but was currently single, living in Spain, and, as Mom put it, had been building a property empire out there for years. They spoke regularly on the phone, but Mom was very excited because Mandy had recently sold up her business and was moving back to the States. Mom insisted that her sister should stay at our place while she found her feet and figured out what she was going to do. She even took the first few days off work, which was utterly unheard of for her.

When Mom first introduced us after bringing Mandy back from the airport, I was lost for words. Mandy was beautiful, with long, straight blonde hair, parted to one side, a lightly tanned, oval face with intense brown eyes, and the most stunning, open smile, showing off her perfect white teeth. It took me a few moments to work out that she must be thirty-two, and I found that very hard to believe.

Looking from one to the other, it was clear that they were related, but Mom was in one of her ‘mumsy’ floral dresses, and had her hair up in a tight, severe bun, whereas Mandy had turned up in skin-tight jeans and a figure-hugging, spaghetti strapped T-shirt that showed off her very impressive boobs to perfection. Not to mention her deep, honey-golden cleavage. I found the way her jeans hugged her pussy absolutely fascinating, and had to drag my eyes up to her face by sheer force of will. I was in love, or at the very least, in lust.

If you’re thinking that I was a fifteen-year-old virgin, who was instantly besotted with every female that he met ... well, I admit that there was an element of truth to that. But I wasn’t a virgin.

I’d like to claim that it was because I was a smooth-talking stud, but it had been largely luck. I’d been at a fairly boring party, nursing my third lite beer, when a girl called Vicky came up to me. She said something that I didn’t catch because of the volume of the music. When I looked puzzled and bent down, she said into my ear, “Do you want to fuck?”. Of course, I wasn’t about to say no, and she took my cheery behind the couch in their games room.

We hooked up several times after that, and I asked her once why she’d picked me that first night. “Well, you’re fairly pleasing on the eye,” she began.

“Thanks,” I said, grinning.

“Fairly,” she repeated with a glare. “You weren’t a jock, who would shout about it all over school,” I nodded in agreement, “and you weren’t a nerd who was going to cum all over my hand as soon as I touched you.”

That was where I got lucky again actually: I’d had some quality alone time that afternoon and had spent most of it beating off. Otherwise, I might well have ended up in the nerd camp. “Now shut up and fuck me,” she said. So I did.

Vicky made it clear that if I used the word girlfriend or relationship to her, it would all be over, but that was fine by me. We had an awful lot of fun and she taught me a lot, not least that some girls like sex just as much as guys do, if not more.

Don’t get me wrong, it was awesome, but she was a bit on the skinny side, with lovely, but small boobs, and not much of an ass actually. Mandy was so much more ... well, she was so much more!

It was only seeing them side by side, that I realized that Mom’s boobs were probably every bit as big as Mandy’s, but, with the baggy tops she normally wore, it was hard to tell. They also barely moved and I’d become convinced that steel girders were probably involved in keeping them in place, or at least hawsers. Mandy’s, by contrast, were held in place by a barely-visible smooth bra that just seemed to accentuate their beautiful shape and let them move quite wonderfully naturally.

My eyes flicked from Mandy’s amazing rack, to the virtual camel-toe of her jeans, to her soft blonde hair framing a face alight with a wide, honest smile, and my heart seemed to melt. Her heart-shaped lips, with a pronounced Cupid’s bow, made me imagine kissing them. In all honestly, there wasn’t any part of her that didn’t make me want to sigh with longing while my cock began to swell.

“Ryan,” she cried. “My God, you’re a man!” She held her arms out and pulled me into a bear hug, mashing her wonderful boobs against my chest, and kissing me wetly on both cheeks. The feel of her soft tits made me even harder and I just prayed that she wouldn’t feel it pressing against her.

As she pulled away, she put her hands on my shoulders and looked me up and down. “My, what a big boy you’ve become,” she said just as her eyes reached groin level.

“Come on, you,” Mom said laughing, and pulled Mandy off into the kitchen, probably to make tea.

As they walked away, I got my first look at Mandy’s ass, and it was a peach. Just a little shake of her ample, but firm cheeks made my groin clench hard. I stood there trembling faintly, glancing down to see how obvious my erection was. The answer was, very.

My aunt was so fucking hot!

That evening, over dinner, Mom and Mandy spent the whole time talking about old times, catching up with what they’d both been up to, and probably some other stuff. To be quite honest, I was lost in a haze of lust, admiring every contour of Mandy’s face, the way her lips moved as she talked, and the dazzling smile that never seemed far from them.

I did pay attention when Mom asked Mandy if she fancied going to the lake the next day. “I’m in,” I piped up eagerly.

“I thought you were going round to Flynn’s,” Mom said, looking puzzled.

I had said that, but that was before I’d seen Mandy. “He ... er ... texted and canceled,” I made up on the spot. There was no way I was going to miss a day at the lake, and the possibility of Mandy in a swimming costume!

“OK, good,” Mom said, but looked at me suspiciously.

After dinner, we moved into the lounge, and then I could admire Mandy’s lovely body properly again. I tried not to stare, but it was impossible, and I had a semi most of the time. On the odd occasion when she got up, my eyes devoured the way she moved and her soft curves, and I got seriously hard.

Mostly she was talking to Mom, but sometimes she would look my way. When our eyes met, she would give me a little nervous smile, and then her eyes dropped to my groin before flickering hurriedly away. Could she see my excitement? I didn’t care. I wanted her to see the effect that she had on me. As if embarrassed, she kept adjusting her top, tugging it higher, but that only made her boobs shake, making me even harder.

“I’m going to have to call it a night,” Mandy said eventually, much to my disappointment. She kissed Mom goodnight, and I was trembling at the prospect of her full lips on mine. Instead, she just stood in front of me and tousled my hair. Of course, that meant that her pussy, lovingly hugged by her jeans, was right in front of my face. I had a sudden intense urge to put my hands on her perfect ass and pull her to me, burying my face in its softness. My cock was as hard as I’d ever known, and I could have sworn that I heard her make a shuddering intake of breath before she moved away.

I have to admit that I jerked off that night purely to the images my mind conjured up of Mandy in a bikini.

Mom and Mandy went clothes shopping the next morning. I was so obsessed with her that I even contemplated going with them, before I finally came to my senses.

When they got back, Mom made us a bag lunch while Mandy went upstairs to get changed. It was all I could do not to dribble when she came down wearing some white capri pants that, incredibly, were even tighter than her jeans. They nestled into the crease in her pussy in a way that made it very hard for me to breathe. That and the fact that I could see her black bikini bottoms through it ... and they were very small! She also had on a black crop top T-shirt which showed off about three inches of bare tummy and a cute little belly button. It wasn’t toned as such, but had a sensual little bulge to it that made me desperately want to stroke it.

We found a place near the shore to lay out our blanket and towels. Again I tried to not be too obvious when Mandy got changed, but my eyes almost popped out of my head as her bikini bottoms began to come down as well as her pants when she began to peeled them off; I could see her butt crack! Mandy’s butt crack! She peeked over her shoulder at me and giggled, “Oops,” before pulling them up. Fuck! Did she do that on purpose? I had to turn over onto my front before my erection became too obvious even in the baggy swimming shorts that I’d carefully chosen.

When she finally managed to take her pants off, her ass looked fabulous in the little bikini bottoms, and so did her boobs in a black halter top.

I lay there in a blissful ecstasy lying with my head on one side, watching Mandy’s golden flesh moving so sensually in the hardly-there confines of the tiny swimsuit, my erection nestling in the hole I’d made in the sand.

Suddenly she sat up. “Who’s up for a swim?” she asked.

“I won’t, thank you,” Mom said, raising her eyes from her book. “And Ryan can’t swim.”

I felt my face burning with embarrassment. “It’s not my fault,” I muttered, “I’ve got heavy bones. Apparently.”

“Nonsense,” Mandy said dismissively as she stood up. “Come on, I’ll teach you,” she added, holding out her hand. The shame had ... cooled my ardor a little, so I thought it was safe to take her hand and let her help me up.

We waded out until the water was about halfway up my stomach. “What do we do?” I asked. I was a bit nervous: previous attempts had invariably involved me swallowing a lot of lake.

“The first thing is to just get you used to floating,” she said, standing right next to me. “Just topple over backward. Don’t worry, I’ll support you to begin with.”

I did as she asked, and she put an arm under my back and one under my thighs. As usual, my butt tried to sink like a stone. Normally, I’d have panicked at that point, but there was no way I was going to make an ass of myself in front of Mandy again. But she held me up so that my head didn’t go under. “Take a big breath in,” she told me.

I did, and miraculously I kind of bobbed up. “Hey,” I said, amazed. “I’m floating.”

“That’s good,” she said encouragingly. “Now try to relax and breathe normally. As I tried to do that, I became aware of the weight of her soft breasts resting on my chest and the warmth of her tummy pressing against me; Inevitably, my cock stirred to life.

“How’s that?” she asked.

“It’s...” Perfect? Heavenly? Awesome? “ ... fine,” I said lamely, acutely aware that the motion of the small wavelets were causing Mandy’s boobs to rub gently against me.

“Oh,” she whispered.

“Oh?” I said, and my eyes followed hers down to my groin. “Oh,” I agreed as I saw my penis tenting my swimming shorts right out.

“I ... er ... think that’s enough for today,” she said, lowering me back onto my feet. It was a while before it was safe for me to come out of the water.

The next morning, I was coming out of the bathroom with a towel wrapped around my waist, just as Mandy came out of her room. She was wearing a white towelling robe which came down below her knees. But it wasn’t bare flesh that made my cock rapidly harden, it was the way it moved: her boobs were bouncing in just the most unrestrained and sensual way. By the time we were nearly passing each other, the lump in the towel was pretty obvious.

“What on earth is causing that, this time?” Mandy asked incredulously, using her hands to indicate first my erection and then her modest attire. “Please tell me that it isn’t my feet.”

I looked down and mumbled under my breath.

“Sorry, what was that?”

“I can’t help it,” I confessed. “It’s the ... way your breasts were moving. They looked so beautiful.”

She sighed heavily. “Good grief, what am I going to do with you?” she said, shaking her head. I had some very specific ideas on that, but I thought it best to keep them to myself. As we passed, I saw that she was looking down at my groin, and there was definitely a smile tugging at the corners of her lips!

The next morning, Mom got a call on her cell at breakfast. She looked at it and sighed. “I’ve got to take this,” she told us and wandered off. When she came back she looked pretty pissed. “One of our major clients is threatening to go to our competitor, and they want to renegotiate their contract,” she said crossly. I’m going to have to go into the office.”

“Will you be back today?” Mandy asked.

“To be honest, I’ll be lucky if I’m back for dinner,” Mom said gloomily. “Sorry. You guys have fun.”

I tried not to let my excitement show on my face. “Shit. Sorry, Mom,” I said with as much conviction as I could manage. Mom was so down she didn’t even ball me out for cussing.

After Mom had left, Mandy took a deep breath and then slapped the table decisively as she stood up. “Right,” she said, “go and put some scruffy clothes on.”

“Why?” I asked, confused.

“We’re going to surprise your Mom by tidying up the wilderness that she calls a backyard.”

It wasn’t where my dirty little mind had gone at the prospect of time alone with Mandy, but I tried to look keen. “Sure. Why not?”

When I came down in a ratty old T-shirt and some old athletic shorts, I had to admit that I loved Mandy’s idea of scruffy: a white, low-cut tank top and some cutoff denim shorts. They were very faded and worn, and hugged her pussy quite beautifully.

“Ryan, you can’t keep looking at me that way,” she said reproachfully.

“I’m sorry. I’m trying but ... but you’re so beautiful.” Even as I was apologizing, my eyes were taking the delightful cleavage between her magnificent breasts and what was almost a camel toe between her legs.

“And you can’t keep saying things like that either. Oh, my God, you’re hard, aren’t you?” I nodded miserably. “It’s not fair, Ryan. I’m not made of stone, you know. Seeing you like that has ... an effect on me.”

Oh, my God! Was she telling me that she’s turned on? I could see that her nipples were erect and her face was a little flushed. The idea made my cock swell and twitch hugely, and she saw it! “Oh, lord,” she muttered under her breath and she walked away, her buttocks jiggling hypnotically.

My erection almost never fully subsided as we worked. Mandy was either bending over facing me, in which case I could see her incredible cleavage down the front of her shirt. Or she was bending over facing away, when not only could I see not only her buttocks peeking out of the bottom of her shorts, but also the top of a thong showing at the top!

I spent the next hour or so in a fog of lust, trying not to be too obvious, but hardly managing to drag my eyes away from her beauty. I suspect more than a few of Mom’s plants suffered from my lack of attention.

Then I found myself watching in open-mouthed awe as Mandy struggled with what looked like a sapling that had rooted itself in a flowerbed. As she struggled to pull it up, her ass cheeks were wobbling absolutely incredibly. I surreptitiously gave my raging hard-on a little rub as she fought with it, totally turned on.

“Give me a hand, Ryan,” she said breathlessly. I wasn’t sure what she had in mind, but I went up behind her and put my arms around her body, grasping the stem just above where her hands were.