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You try to wet your mouth as your sister screams. She's so loud it's startling, and you wish she would stop already and just cry quietly, but you also know how difficult this is for her. You remember your own first time when you were six, and she's even younger than you were.
She's writhing and thrashing around, trying to twist away from dad's grip, but she's tied up tightly to the bedframe. She had tried to hide after she learned he was about to do it today, and so he in turn had to bind her hands with packing tape. They're all red now and it looks painful. Getting it off will be awful.
You have to hold one of her legs, so dad has proper access, and she has already kicked you in the head, though she's probably not trying to hurt you. You're not angry at her.
Dad is plowing into her tight cunt, still undeveloped and way too young to be prepared for something this rough. She probably won't be able to walk much today. Even with his hard thrusts, he can only fit less than a half inside. It's not easy to fuck something this small.
He pulls out again, and you're quick to grab his cock. It's hard and big and in the dim light you can't see it well, but when you put your mouth to it, you can clearly taste the blood.
She's still much too young for this, but dad had decided not to wait anymore, so you both have to manage somehow. Her cunt is still unable to get slick by itself and the friction is necessary, so that's your role. You move your head up and down in a well trained movement and wet the cock as much as you're able to. It's good that she's so small, because you don't have to do it up to the base. You get your spit all over him again, then back away. He moves to your sister, and you help him slip his cock into her bleeding hole.
Your own cunt is still wet and throbbing slightly, but you can't touch yourself right now. Dad hates when you do that. He says you're not supposed to focus on your own pleasure, only the cock that's using you. But before he started with your sister, he had fingered you for a while and then fucked you for a short time, just to slick himself with your cunt. He might be driving into your sister hard right now, but it's nothing compared to how he is with you. He knows that you're used to it, that you won't break, and because of that, he rarely holds back on your holes. It was quick but painful, and you can still feel the place inside you that he hit. You will finish yourself after you're done.
He pets you on the head with the hand he's not holding your sister's leg. She's still thrashing around in pain and crying, but sounds more tired now. It has to be so awful, being opened and used so violently, without preparation, without your body being even remotely ready for it. You almost whimper as your cunt twitches again.
Your slick does not last for long, and the blood makes for good lubrication too, but there's not enough of it. After a minute, you have to wet him up again, and again. He pats your hair and tells you you're doing a good job. Your sister's cunt tastes sweet, besides the metallic flavor of blood. After enough times you're able to pick the different things apart.
Finally, your dad comes. His thrusts grow erratic, and he doesn't pull out for you to lick him for much longer than before. He drives as deep as he can into the little fuckhole, and you think you can see her stomach bulging. It looks obscene. He finishes inside her pussy with a grunt and stays like that for a while. Then he finally pulls out, you quickly move to clean him off. You lick the blood and semen off of his cock as well as you can. The familiar bitter taste mixes with the new metallic one. Your own cunt is pretty much dripping slick by now.
Your sister is crying quietly, unmoving. Her legs still dangle apart, lifelessly, as she sniffles. Cum trickles out of her used up fuckhole, obscenely widened by the violent intrusion. Before, when you were helping him push inside, she was so tight you could barely see the opening. Now you could easily slip a few fingers inside. It looks raw and painful to the touch.
"Clean her up," dad says, tucking his cock back into his pants. "And get her out to her room."
You nod wordlessly, and he gives you one last pat on the head. Your sister flinches and gives one louder sob when you spread her pussy in front of you, but doesn't try to fight you. You press your mouth to the violated hole and start licking.
She's so soft and hot inside it makes you shiver. Now that dad is gone, you can finally touch yourself in peace. You shove three fingers inside yourself and start pushing in and out. They're way too short to really do anything, but it feels a little bit like being raped again, and you're so used to the stretch you can't really come without it. You moan silently into your sister's cunt. You can still feel the sweetness underneath the bitter flavor of your dad's semen and her blood. You stretch your tongue as far as it can go, and she constricts around it, but she's fucked out open far too much to be able to stop you.
You love doing this, and you don't get to do it often. Only sometimes, after dad fucks your mom you get to clean her up, and he does it rarely now, because you're so much tighter, and he likes your holes more. And mom is so different, so much wider from her age, and tastes not even close to this sweet.
You swallow as much of the dripping out cum as you're able, while your sister whimpers. You wonder if it still only hurts her, or if she's able to feel at least a little pleasure from it. Your fingers work furiously in your own fuckhole, and you're getting desperate, rocking your hips back and forth.
Finally, when no more pink fluid floats out, you're able to use both hands on yourself. You stroke your clit fast, press painfully into it until your hands shake. It's always hard to finish, and it leaves you in pain and sort of regretting you chose to do that. But that's for later to worry about. You dig your fingernails into yourself so hard you're probably leaving marks and that finally does it.
After cleaning yourself, and after whimpering from pain for a while, and after getting up from the floor, you finally sit down next to your sister. She's still crying softly, her face all red and wet.
"Come on," you say, reaching for the scissors on the nightstand. "Let's get the tape off and get you out of here, before dad decides he wants another go."