She's overcome with lust.

Emily leans and begins to kiss her Stepsister's neck.
That was her chance to try and tell the truth and get out of this.

She didn't take it.

Instead, she wanted to pleasure Veronica more than anything else.
She's never cum that good and that quickly.

"How sensitive are you here," she says, giving her nipples some kisses.
Veronica is still gagged, but tries to answer.

It didn't really matter as Emily starts sucking on her nipples all the same.

Recently, she accidentally came across a bondage video of a brunette- like Veronica- dominating a young woman with a similar look and build to herself.
She couldn't help but picture herself there.

She told nobody about this.

Veronica loves this.
While not as sensitive as Emily, the now-gone taboo of this, plus the bondage, has gotten her nearly there without her pussy even being touched.

She cums hard, resting her head on Emily's shoulder.
You lean in and pull off her gag, removing the panties too.

"Thank you, Master," she says.
A moment of silence.
"Thank you, Master," Emily says.

You scream and shout with joy- internally. It worked!!!!
Ahem.

"How about you two show me how much you appreciated what I gave you," you say with a smile.
"Yes, Master," they say in sync.

You undo your pants and prepare to live the dream.