You mount her this time

Unable to resist site in front of you, you got down onto your knees and climbed between hers, making Kelly lie down on her back. Lining yourself up with her entrance, you began rubbing your swollen, mushroom tip up and down the length of her slit, causing her gasp in anticipation.

"Oh god David, my cunt's already so wet for you! Don't tease me, stick it back in!" she pleaded, spreading her legs wide and thrusting her hips up to meet you.

In truth, you were more than ready to get back inside her as well and did exactly as you were asked, sliding your stiff member between her folds and back into her steamy depths. "Goddamn your pussy feels fuckin' amazing!" you told her as you felt her wet heat surrounding you once again. Past experience has taught you that with this being such a quick turnaround, if you didn't keep up a steady pace, you risked not being able to finish, so you wasted no time getting right back to work, moving your dick in and out of her slick pussy.

"Oh god, David, I so picked the wrong brother! Brandon can never go again this quickly! You're such a stud!" she purred.

Her talk only served to spur you on and, wanting to show her how correct her statement was, you reached down with your hand, grabbed hold behind her neck, and started pulling her towards you with every one of your thrusts while gradually picking up your pace.

"Fuuuuu...hhuuuucccckkkk! Holy shit David, that's sooo gooood! Steal my pussy from Brandon and make it yours! Oh my god! Give me every inch of your fucking cock! Pound me David! Pound me!" she screamed out, throwing her head back in ecstasy, tears welling up in her eyes from the intense sensation.

The taboo nature of what the two of you are doing and every word of encouragement from Kelly makes you want to do exactly what she's asking for and you slam down into her with all your might, pounding into her harder and faster at such an aggressive pace, you know you won't be able to last long despite cumming so recently. This approach seems to work just fine for Kelly, because before you know it, she's screaming obscenities as her eyes roll back into her head and her pussy begins contracting around you. Just like your first go around, you don't slow up and it's only moments before you feel your own climax rushing up to meet you.

You keep fucking into her, trying to hold out for as long as you possibly can, but as you start to feel the cum boiling up within your balls, you quickly pull out from her and climb over her chest. Grabbing hold of your shaft, you rapidly jack your cock, taking aim at her face just in time to unleash your first blast onto your intended target. Holy fuck, the intensity of it! You let out a yell as the first spurt borders on being painful, shooting across her face and into her hair, but you keep pumping, splattering a surprisingly copious amount of your seed onto her smiling face, chin, chest, onto her tongue, and into her open mouth.

You never dreamed your sister-in-law was as big of a freak as she was showing herself to be, giggling like a pornstar as you shower her with your cum, and if she's even half as enthusiastic with your brother as she's been with you, you're surprised he's found the need to look elsewhere for sex. As your movements slow and you milk the last of your cum from your dick onto his wife, you think to yourself his loss is your gain and you plan on taking full advantage of it while you can.

Balls finally emptied, you take a moment to admire the image of Kelly beneath you; smiling and panting on the floor, basking in the feeling of being covered with your cum, then dismount her before she starts trying to latch onto your dick with her mouth as you know there's no way you can handle that type of stimulation again.

Physically exhausted from back to back rounds of sex, you don't make it far, and merely sit on the floor next to her, back supported against the couch with your rapidly deflating cock dropping down to rest harmlessly between your legs.

Kelly tracks your movements and turns her head to look at you with a look of wonder on her face. "That was incredible David! Brandon never makes me cum like that! Shit, come to think of it, I can't think of anyone that's made me cum like that before!"

"It was pretty great for me too Kelly." you complimented her. "You're so wild and get so into it when you're fucking, it just makes me want to satisfy you even more."

"Well you satisfied me all right, like six different times!" she said giggling again as she rose to a sitting position next to you, grabbed her shirt from the floor, and used it to wipe your cum from her face.

"Six, huh?" you asked. "I thought you only came three times?"

"Mm-hm, three big ones," she told you, grinning at the memory, "but three smaller ones mixed in there too.".

"Well then, how many more times do you think you'd like to be satisfied today?" you asked, reaching over to fondle and cup one of her heavy breasts in your hand.

"You want to keep going?" she asked with surprise in her voice.

"Well, not right this second." you laughed, looking down at your half-flaccid dick. "I told you before we'd be doing this all day and I wasn't kidding Kelly. I'm just gonna need a little time to rest up and recover before we go again is all."

"A little rest is OK with me. I feel like I've been in a gang-bang with the amount of cum I've got on me and how abused my pussy feels right now. Why don't I go rinse off in the shower then we can have something to eat to get our energy levels back up and you can see if you want to keep going after that. It's ok if you can't. You've already more than met any expectations I had." Kelly told you before climbing to her feet, turning, and walking down the hall towards her room.

You didn't waste the opportunity to admire her plump, naked ass shaking back and forth as she moved away from you and started thinking about how good she must look on her hands and knees. As you slumped against the couch and let your head rest against it, you found that thought wouldn't leave your mind and realized, despite cumming twice already, you were still horny.