Make her dream come true

You don't need to think twice before you move. As you get up and move away from Jennifer, she begs and pleads with you to stay with you. Ignoring her, you move to Amy's door.

As you enter her room, you see she's done what she can to commit to her little fantasy. She's laying chest down on her bed facing away from the door, her legs splayed out and lifted at the knees as she twitches them just enough to jiggle her ass around. She still has her headphones on as she hums a tune, so she probably didn't hear you enter, or at the very least she is pretending not to. Walking closer to her, you see her crotch is flooded in anticipation. You move onto the bed as silently as you can, preparing to make your strike. You grab her by the neck, shoving her face into her bed and pinning her down with ****. For all her anticipation Amy seems caught off guard by your sudden intrusion, letting out a loud gasp as you slap your titanic cock on her ass.

Your huge cock makes a heavy thud and shakes the ass you're about to rip the shreds. Amy moves her head just enough to peer over her shoulder and see you rip a small hole in her skinny jeans. Her plump ass takes care of the rest, finally winning its battle against her pants. Seeing this and your huge cock makes her panic.

"Wait, no! You can't. Please, no! With a cock that big, you're going to break me in half!"

You tell her that's the idea as you line your behemoth cock with her asshole.

"Wait, no - my ass?! You can't, you're too big you'll-"

You cut her off as you embed quarter of your massive cock into her ass. Amy is tighter than her mother, so to compensate you're being as brutal as you, can putting all your might into shredding your poor niece's ass. Her cries reach a shrill ear piercing scream as you do everything you can to break her. You tell her that her screaming on turns you on more. In response she screams louder.

"Oh god please, you're too big!"

"You're breaking me!"

"You like hurting me don't you?"

You look you up at her face after she says that and through her pain stricken face she flashes you her damn smirk. Amy is teasing you, trying egg you on to be more violent.

You muster all your strength and start to brutally destroy her ass. Amy was not prepared for the brutal **** and starts to struggle, her breathing is laboured. She's overwhelmed by the pain as you jackhammer her ass to ruins. You continue for some time, getting caught up in how amazing her ass. You hardly notice her drifting between conscious and **** states. After you've fucked half your length into her, you decide you want to change it up. But after you dismount her, she manages to make a run for the door. You're stunned that she can even move, let alone get up and run. But when she reaches the door she fumbles with it for so long that it seems like she's try to let you catch her. As you get up and move towards her she gives up on and presses herself against the door looking back at you.

"How hard are you going to punish me?"

You don't bother answering as you pin her to the door and slam back into her ass. As you pound her ass you have no doubt Jennifer can hear it as you break her daughters ass. You look down at Amy's face and you can see she is barely awake anymore her eyes are fluttering and her mouth is hung open. After a few moments there's a knock on the door.

"Hi you two...um...are doing ok?"

You're not quite sure to answer the mother of the daughter who's ass you're currently railing. Lucky you don't have to as Amy manages to speak up.

"I...I never thought it could...hurt this much"

"Maybe I could come in there and help her. I could lube your cock so you can keep fucking her ass"

You could have Jennifer come in and help or you could use this as a chance to make Amy compete with her mother even more. So you decided to give her the choice she can ask her mother in help her with your cock or she could let you keep tearing her ass to shreds. Of course you can't help but mention Jennifer didn't need help.