A probed posterior

"Get up on your hands and knees," your stepdad instructs.

"Okay, daddy," you giggle and roll onto your hands and knees on the bed.

The uniform skirt barely covers your butt and your big tits are falling out of the unbuttoned shirt.

"Oh, yeah," your stepfather says admiring your physique.

He kneels behind you, running his fingers up the backs of your legs to the firm globes of your ass. He flips the skirt up onto your back and squeezes your cheeks. You wiggle from side to side and he swats you on the butt.

"Ah!" You cry at the stinging slap.

"I still think you're a bad girl," he says.

"No!" You pout. "I'm good, daddy!"

"A good girl would never have an ass like this," he chides and slaps your other cheek.

"Oooh, it stings!" You exclaim.

"Yeah, you're a bad girl. Do you know what bad girls get?"

"No, daddy," you reply, trying to act afraid.

"They get their tight little asses fucked," he spreads your cheeks to admire the pink bud of your asshole. "Is that what you want, baby?"

"I don't know," you reply. "Your cock is soooo thick."

"Yeah, it is," he agrees. "But I'll get you ready."

He lowers his mouth to your ass and begins lathering your clenched hole up with his tongue. You squirm against his mouth.

"Ohhh," you moan as his tongue presses inside your ass. "That feels really good."

You reach between your legs and play with your clit as he tongue-fucks your ass. It's a wonderful sensation, but his tongue is soon replaced with a probing finger. You gasp as it pushes inside you and moan as he fucks it in and out of your tight hole. You cum just from that and he laughs as your asshole clenches and releases orgasmically around his knuckles.

"A very, very bad girl," he says and withdraws his finger as you finish cumming.

The jointed intrusion of his finger is quickly replaced with the fat head of your stepfather's juicy dick. He pushes it against your spit-slicked asshole and you relax your muscles to allow him inside you. You moan together as his cock parts your puckered pink.

"God it's so hot and tight," he groans.

You push back until you feel your ass collide with his pelvis. He's buried in you to the hilt, filling up your ass with his stiff dick. He slowly begins to work his cock in and out, careful not to hurt you with his measured thrusts. He soon forgets being gentle and he grabs your hips to slam his cock into your ass again and again. You frantically rub your clit as your stepdad pounds your ass, ramming his cock inside you.

"Oh fuck," he groans. "That ass is gonna make me cum."

"Yeah," you pant, slapping your ass against him. "Fill me up, daddy."

"You want this?" He asks. "You want my sperm in your asshole?"

"Shoot that big load in me!" You cry as your orgasm crashes out from your clit.

"Nnnnnnnnhhhh!" He cries, throwing back his head and pounding hard into your ass.

You feel him cum, your squeezing asshole gripping him and tugging him as he pumps you full of his hot jizz. Again and again he rams himself between your cheeks, impaling you and launching another gooey rope into your bowels.

"Take it!" He cries, draining out the last of his sperm up your ass and then pulling his cock out with a pop.

He slaps his dick on your ass cheeks as his cum bubbles out of your gaping hole.

"Look at that," he laughs. "My little girl is an ass whore."

You giggle and fall together on the bed. You stroke his sweaty face and kiss his lips then work your way down to suck his cock. It has a bitter taste mixed with the salty cum, but you don't mind. You look up at him as you bob on his dick until it hardens once again between your lips. By the time you settle in beside him again he looks to be ready for another round.