It was the day after Justine returned from Italy. She and her brother lay on the bed in the bright midafternoon; his cock was firmly embedded inside her as he lay on top of her full contact, barely moving. She sighed, "Oh Justin, what a way to make a girl feel at home. I swear you've grown an inch or two." She ground her hips, bringing a smile to his lips.
He whispers in her ear millimeters away. "You're welcome, Justine. I was going to say you've gotten tighter if I didn't know better."
She smiled comfortably and whispered back, "I'm serious, you are bigger. You didn't fill me up this much before I left."
"Auntie Pru measured me last night: ten inches."
She nodded her head. "I knew it: a late growth spurt. Feels so good to be under you again."
"Nobody grinds her hips like you do, sis. It's been too long since your heels were on my butt like this." She dug them into him as they ground their crotches into each other.
She said, "How's Auntie Pru, anyway? I remember that you've been helping her with more than the yard work, you little perv."
"She's been a real help with the college classes I'm taking. Every time I've had a big paper, she's proofed it for me, and I've been doing her yard work."
She gave him a disbelieving look, and a light smack on the backside. "You little perv, with the start you had, I bet you've made her your personal painslut by now."
He giggled a little bit. "Well, you're the one who told me about her. You've given me everything: my first peek at a naked girl, my first handjob, my first blowjob, my first fuck. You taught me how to lick tits and pussy. Why shouldn't you give me Auntie Pru?
"Jealousy, maybe. I love what that woman let me do to her. Well, you're the reason I came home and why I'm on the Pill. Got big news for you, but not yet. Oh, that monster feels so good inside me; it's been too long, donkey dick." She luxuriated and held his entire body against hers tightly as she ground her hips against him.
Justin whispered in her ear, "Do you wanna hear what we did last night? I took pictures."
She gave him another playful smack. "Oh, you little horndog, yes, yes. Show and Tell time."
He looked a bit confused. "While we're fucking?"
She nodded. "Oh yes, the thought of Auntie Pru's big white tits and what can be done to them makes me so wet. Unless your brain is so completely in your donkey dick you can't function otherwise."
"Okay. Let me grab the laptop and put it on the bed." The laptop was on his night table and he was able to move it so they could both see it easily lying cheek to cheek without pulling away from her. He opened the folder and hit a couple of buttons. "Look there, wait, I'll make it full screen."
She made a face as his cheek lay heavily against hers. "Ow, you didn't shave today. Your stubble is rough."
"Shut up, you know you love it when we lie cheek to cheek. Anyway, the first picture is her lily white tits. She's got her hands up over her head and sticking her chest out. Don't they look sweet?"
"Mmmm, a trip down mammary lane." He slapped her butt with a loud crack. "Ow! What was that for?"
"You deserved a smack on the ass for that line. Last night, we did things a little differently. She always loves getting this big white babies sore and red. . ."
"Yes, I just loved how she got so eager to pull out those tits for me to smack around. It became a habit."
He nodded. "Yes, sister, I can tell how much you loved it; my dick is now twice as wet in your cunt. Well, this time I teased her a bit. Look at this pic."
A pair breasts tied in a figure eight with nylon rope appeared. "Purple?" she said. "Where did you learn to tie tits like that?"
"Online. Step by step instructions, including how purple to let them get. Wanna try it?" He said with a leer.
"Let me think about it, OK? God, I love your cock up my cunt. What's next? Wow, I never knew her ass was so big. Your hand is a great perspective. How did it feel?"
"Soft as a baby's bottom, well when I started it did. This is how it looked a couple of minutes later."
"Nice pattern, Justin. Pump a little harder, won't you babe? The pattern's very symmetrical, what's next? Oooh, that's really getting red. The third is really angry. Oh, oh, oh, oh, oh. You did this with a belt?"
"Yeah, I always just use the belt on her, or my bare hand. The next thing I did was I fucked her doggy style, right then and there. It always takes her a while to get used to my massive meat in her cunt, see? It took five minutes to get up to the balls."
"I know how she feels. Oh, oh, oh, oh, harder, sweetness, harder. Yes, yes, yes. Oh my god, did you butt fuck her next?"
"Oh yes, she came long before I was ready, so I pulled out of her cunt and fed it slowly up her ass. She howled like a banshee but she bucked harder against me than ever. Her ass was so tight: I took her ass cherry and it was wonderful."
"That's more than I want to do. You know, she's a lesbian, or at least she was. I'm glad you've got a nice ass to fuck now. That must have stung like hell after you blistered her ass."
"It did. She told me she never felt anything like that before and orgasmed again when I came up her butt. Oh sis, you're getting close, aren't you?"
"Yes, let's flip over so we can make the moment last." They managed to switch without disengaging. "Yes, it's so good to ride this donkey dick again." She began bucking as she rode him more and more urgently.
Justin looked at the breasts hanging in his face and said, "Sis, I think your tits have gotten bigger. Did you get an operation?"
"No, of course not, silly," she gasped between strokes.
"I think you're lying."
She gave him a wicked grin. "Well, check it out for yourself."
"I will." He started to massage her breasts, gently at first, then more energetically as she kept pumping him. "Still nice and firm, nothing feels foreign here. Have to check the nipples close up." He leaned forward to engulf her left breast.
"Mmmm, your tongue work is getting better. Ah, a little bite, mmmm. You can do that again. Yes, yes."
"Well, I've had a couple of tasty ones to practice on. Auntie Pru lets me really chop on her nipples before I beat them. And after."