Stevie did even more than that, though. He was on a roll now, his macho instincts taking over. Instead of having to think about what to do next, he just automatically knew what would work on Amy. And, along with sucking and fucking her, at this point that meant reaching down below the tangle of their loins to explore his sister's wiggling ass.
"Yes!" Amy cried. "You must've read my mind, Stevie! My ass needs something just as much as my titties or pussy if I'm gonna keep on coming! Please do it to me!"
Stevie's fingers crawled along the crack of Amy's ass. Then he'd located the special prize down there – her other fuck-hole.
"Finger-fuck me there," sister urged brother. "Finger-fuck my ass!"
Stevie didn't have to be asked twice. His middle finger slipped inside Amy's tightest opening and started pumping to the same rhythm as his cock in her cunt.
"Ooooh, that feels so good!" Amy sang out with joy, having discovered that her asshole was just like her tits – anything sexy happening there went straight to her pussy. "You keep this up, Stevie, sucking, fucking and fingering me, and I won't stop coming until after you have too."
"That might be quicker than I thought, Sis," Stevie admitted, slurping at Amy's spit-soaked tits. "I thought I could hold off longer than this since I already came twice before, but, damn, my balls already feel like they're turning blue."
"Don't worry about it," Amy countered. "Just do what's natural and let everything take care of itself."
"Well…"
"Don't you see, silly?" Amy impatiently panted. "I want a cuntful of your jizz as soon as I can get it."
"But I only just started fucking you, Sis," Stevie said self-consciously, starting to worry again about his performance.
"Don't worry, you can always come back for more. This may be our first time but it sure as anything won't be the last," Amy coaxed. "Please, Stevie, please! Come in my cunt! Now, Stevie, now!"
"Okay, Sis, you got it!"
Stevie's cock lurched and exploded at the depths of his sister's pussy. And the momentum of his gushing climax was such that it seemed to command him to jam a second finger up Amy's shitpit at the same time his jizz erupted in her cunt. This made it almost as if she had an extra cock filling her butt while her pussy was swamped with cream by Stevie's real prick.
"Mmmmmm, I feel soooo fucked!" Amy swooned when her brother's cock had finished spilling its hot, sticky load.
"Yeah, me too," Stevie sighed.
They lay there for a time, then he began to unravel from her. First Stevie's drooling mouth left Amy's sucked tits, then his dripping prick slid from her fucked cunt. However, when he started to remove his fingers from her asshole, she stopped him.
"No," Amy protested, "leave those in there. In fact, add another one."
"Huh?"
"I'm finding out that I really love it in my ass!" Amy explained. "So while you're waiting to get another hard-on, why not just keep finger-fucking me where I shit?"
"I-I've always wondered about that," Stevie gulped. "Since it's so close to their, uh, cunts, you know, if girls feel anything special in their, uh, asses."
"This one sure does," sighed Amy. "C'mon, give me that extra finger."
Stevie cautiously forced it in, surprised at how much a female asshole could stretch to take.
"Now move 'em," Amy directed. "Yes, just like that… in and out… back and forth."
Her hips began to roll, just the way they had when her pussy had been getting fucked. Indeed, even though it was the opening a notch away that was currently penetrated, her pussy foamed at the lips with the fresh juice of arousal.
"What you're doing to my ass is going right to my clit now," Amy moaned.
"You can come this way, then, Sis?" Stevie asked in wonder.
"Don't have any choice, thank God," Amy moaned some more.
Then she climaxed, shuddering and whimpering with delight. And following her previous orgasmic pattern, she immediately wanted more.
"Oh, do it, do it up my ass even harder, Stevie," she gasped. "So I can close my eyes and pretend that instead of your fingers it's really your big, hard cock fucking my butt…"
And as soon as she'd said it, Amy stopped short. A devilish smile creased her normally angelic features.
"Why not?" she then wondered aloud.
"Wh-what?" her brother nervously asked.
"No point in pretending when I can have the real thing, now is there?" Amy steamily asked.
"God, Sis, you mean?"
"Mmmm-hmmmm!"
And to confirm what her brother had guessed, Amy reached down with both hands toward crotch-level. With one of them she removed Stevie's fingers from her asshole, while with the other she tugged at his cock.
"Yes, Stevie, just what you think," Amy said. "You can do it. Fuck my ass for real with your big, hard cock!"
"Aren't you afraid it'd h-hurt, Sis?" stammered Stevie.
"Oh, I hope so," Amy recklessly replied. "Hurt sooo goooood!"
"But my cock's not all the way hard again, Sis," Stevie stalled.
"Leave it to me, stud."
Then Amy drew her legs all the way back over her head, jack-knifing her naked body. This lifted her ass and then she yanked the cheeks apart. The dusky eye of her shitpit seemed to wink in seductive invitation at Stevie.
"Get it up. Get it up and fuck my ass!" Amy breathlessly called.
"You win, Sis," Stevie called back, his cock abruptly twanging to throbbing attention.
He approached the target, hard-on in hand, nudging its swollen head against the puffy dent of its target. In response, his sister hooked her legs over his shoulders, setting her hips to push back while Stevie set his for a cock-thrust.
"Now!" Amy demanded.
Her hips lurched while her brother's cock stabbed into her with driving force. The result was all of his six inches buried in her asshole on the first try, celebrated by an almost deafening cry on Amy's part.
"Oh, God!" she shouted. "Hurts even better than I thought it would! Never felt so full of anything in my life!"
"Then you're gonna come, Sis?" Stevie anxiously asked.
"More than that!" Amy squealed. "Hope you don't mind it messy!"
Then her asshole orgasmically spasmed like a tighter version of her cunt around her brother's hilted cock. But the rest of the story was what really caught Stevie's attention. For something hot, wet, and, slimy was suddenly seeping down his prickmeat. And considering the part of Amy he was fucking, it could only be one thing.
"Shit," Stevie muttered. "You're shitting on my cock, Sis."
"Sure am!" swooned Amy, without the slightest trace of embarrassment. "Coming and shitting! Shitting and coming! Never thought I could do something so dirty – but now that I am, isn't it fantastic?"
His sister's enthusiasm for sex at its dirtiest immediately swept Stevie up in its tide. Taking advantage of the slime, he began pistoning his lubed cock in Amy's shitty asshole. In turn, she came even harder, the juice from her untouched but oozing pussy leaking down to drench the root of Stevie's butt-fucking prick, along with his grinding crotch and churning balls.
"This is the best yet!" crowed Amy. "Now all there needs to be to make it perfect, Stevie, is my ass full of your jizz! How long, stud?"
"Getting closer to shooting my wad every time I rip you, Sis," Stevie croaked with yet another surge of his tireless prick. "And when I do, it's gonna be the most jizz yet. So just hold on, and…"
Amy went on, all right, gripping her brother's hilted cock with the tugging vise of her asshole. Then she rolled her hips for some cork-screwing friction, stepping up the timetable for her brother's latest eruption.
"You want it that bad, Sis?" Stevie exclaimed. "Then how about right fucking now?"
His prick promptly gushed with liquid flame. Her ass instantly flooded, Amy burned within. Her brother's scalding cum was mixing with her molten shit, creating a river of slimy fire that flowed both ways, some of it backing up within her orgasmic bowels and the rest leaking from the cock-stretched rim of her fucked asshole.