I don't even know why I did it. I really don't.

My niece is "cute enough", but a bit on the big side. A bit of a stomach, and a bigger butt. But fuck, she's had the nicest set of tits I've ever seen on a girl her age. And she's had boobs like that since she was about 14.

She just turned 18, is going to college this fall, and she's a good kid. Cute, funny, outgoing, and we'd never even flirted. Never said a single sexual thing towards each other. Nothing. Literally, it'd never come up in conversation.

But two days ago, she was leaning into my car window, when I'd gone to pick up my step daughter at work, and I couldn't stop staring at those boobs. They fucking turned me on. And she said to me with a giggle, "Uncle Dave, are you checking out my boobs?" and I laughed and said "Sorry". She just giggled, and said "That's funny. But it's OK"

Two days later, I was at home. My niece called, and I told her no, I was alone. Everyone was gone for the evening, and weren't going to be back for like 4-5 hours. They'd gone out of town to visit my folks. She said that's cool, and wanted to know if she could stop over. I said sure. I had no idea what she wanted.

I opened the door, and Julie came into the living room. I'd just said "what's up?" and she closed the door. She said "Is Aunt Emily gone for awhile?" and I said yeah. And Julie looked at me, and said "I wanna have sex"

I just looked at her, and said "You what?" and she just said "With you. I mean, I wanna. If you would?" I just looked at her, and said "Uh. Julie. I'm not sure that's a good idea" and she said "Why? I'm 18. It's not like anyone would know. I dunno, I've thought about it. I just, well, I wanna. I won't tell nobody"

I had never even looked at her that way. Ever. And I have no fucking clue why that day I changed my mind. I think honestly it was her tits. I was staring at her fucking boobs, and she pulled her shirt and bra off. And I stood there, getting insanely hard looking at the nicest set of boobs I'd ever laid eyes on. Without a word, I walked up to her, and put her nipple in my mouth. I heard her go "OH" and I started sucking. As I'm sucking, I felt her hands move. She's unzipping her shorts. She's pulling them down. I heard her pulling something else down, and I look, and see her pudgy thighs, and a huge thick patch of pubic hair. I was so goddamn hard.

Julie tried to pull back, but I pulled her up against me, still in my shorts, and sucked on her other nipple. She was moaning, and I pulled down my shorts and my underwear. I was in my shirt, and I stood up, and pulled it off.

Julie and I were kissing intensely. She was breathing really heavy, and I stopped, pulled back, and said, "are you sure you wanna do this?" She looked at me, breathing hard, and said "Please Uncle Dave. I wanna. Really bad" So I just didn't stop. Even though I'm sure I should have.

I pushed Julie to the floor of my living room, and started crawling all over her body. Kissing her mouth, her neck, her boobs, sucking her nipples, and listening to her moan. I was kissing on her bigger stomach, and I said "Oh. God. Let me go down on you. Fuck I want to eat you so bad" and I saw her spread her legs. God. What a thick patch of pussy hair. I buried my face in it, and she shoved her pussy into my face, and said "God. Oh. God"

I felt her squirt cum all over my face. It was soaking me as my tongue was in her pussy. I was licking her furiously, and I was eating on her, and I heard her say "God. Uncle Dave. Please. Don't stop, please don't" and honest to God, I bet Julie came at least 4 or 5 more times. Just when I thought she was done, I desperately wanted to fuck her pussy, I'd heard her moan again, and say she's gonna do it again. And damn if she didn't.

She finally laid there. I pushed her legs apart, and said "Julie? I wanna have sex with you. Do I need protection?" and she said "No. I'm on the pill" and that's all it took. I took my dick in my hand, and I slid it slowly into her pussy hair. I felt it enter her, soaking me, because her pussy was so wet, and I went all the way in her. I grunted, and said "Oh. God. Julie. Holy shit. You feel so good" and she wrapped her arms around me, and she pulled her legs around my back and shoved me deeper into her. I just gasped and went "Oh my God" and she pushed harder, and said "you feel real good. I like having sex with you" I just kind of laughed and said well, I like it with you too

We were in that position with me inside her for the longest time. I was thrusting in and out, and sliding in and out, and I felt her go "Oh. I'm gonna do it again" and she came again, soaking me. And then a couple of minutes later, I said "God. Julie. I'm gonna do it inside you. Is that OK?" and she said "Yeah. It's OK Uncle Dave. you can" and that's all it took.

When I was done cumming, we just laid there. A couple of minutes later, she told me she had to pee. So she got up, and I watched her naked body walk across the room. She came back from the bathroom and we got dressed talking.

We haven't talked about it yet. But I really want to fuck her again.