Yes, very much.

The strap-on now fully lathered in lubricating oil, Sabrina moves forward, touching the tip of the dildo to her little sister's virgin asshole.

"Do you worst," Emma says defiantly, her expression stony and resolved.

"Be careful what you wish for you little slut," Sabrina replies. She pushes forward, trying to **** the dildo into Emma. Emma yelps as her asshole starts getting **** open, and involuntarily moves forward, escaping the invasion.

"I told you you're too much of a fucking wimp," Sabrina says.

Now's a great time to raise your suggestion. "I think if Emma is so confident she can handle this, I propose Emma gets tied up so she doesn't involuntarily try to move away."

"I'm no fucking wimp," Emma fires back, clearly now too far in to back out, "tie me up John I don't care, let's get this over with."

Sabrina is only too happy to oblige, and the two of you tie both Emma's hands and feet. Then you tie Emma's arms and legs further so that at this point she can barely move. There's fear in her eyes now but she purses her lips shut, stubbornly refusing to back out.

"Okay, all done now, no escaping the dare now Emma," you say.

"That's right you little whore," Sabrina mutters angrily. She takes up position behind Emma again, and pushes forward. The head of the dildo strains to part Emma's asshole, seemingly far too big to fit. But Sabrina keeps pushing.

"aaa-aaAA-AAAAAAA!!" Emma's groan is at first low and uneasy, expressing discomfort at the new feeling of anal violation. But the volume quickly increases to a scream as Sabrina continues trying to **** the head of the dildo in. It's starting to enter Emma, who's asshole is now clearly being **** open by the ****.

"AAHHHHHHHHHGGHHHH," sis screams again as the very tip of the dildo starts to full enter her anus, disappearing into her body. Her eyes are squeezed shut in pain, but Sabrina seems to not care. In fact, Sabrina seems to be enjoying punishing her system, her hardening nipples clearly poking through her top.

"Shut up you fucking slut," Sabrina belittles Emma, as she mercilessly continues to **** the dildo in.

Tears start welling in Emma's eyes as her body jerks to try and escape, but you've tied her in place and it is in vain. She's crying now as the dildo's head fully enters her.

"GAHHHHGHHH," she screams again, "PLEASE PLEASE, AHHHGH, JUST, AHHH, ONE MIN, JUST GIVE ME, AHHHH."

The dildo is now pushing farther in, almost one third in. Emma is thrashing against her restraints to no avail, and you swear Sabrina's lips are curling upwards slightly into an evil grin.

"PLEASE, STOP. STOP, AHHH, I CAN'T, PLEASEEEEEE"

You're afraid someone might hear the commotion, so you grab a gag and stuff it into Emma's mouth. She looks up at you with tears streaming down her face, her eyes pleading for you to step in and put an end to her ****. But you just pull out your phone and start recording.