You resist and she fights back.

You and your sister **** start to think that you may prevail as your mistress finally pulls her cocks out of your pussies with a look of near exhaustion on her face. But She isn’t beat yet.

“Silly girls, you didn’t think you could outlast me did you. You will pay for your insolence. Now you will beg me to fill you with my seed or I shall fuck the two of you till your little hearts give out.” As she finishes this she simply positions her cocks and thrusts one in each of you once again. However it isn’t your cunts she fills this time but your asses. You hear a chorus of moans and whimpers come from you and your twin as the huge cocks plow into your ass filling your belly.

The two of you can feel your insides being torn apart by the massive cocks but you have been apparently remade to handle the stress and as your eyes roll in the back of your head you call out. “Oh god I love it.”

Defiantly your twin answers the call herself. “Yes fuck me, fuck me raw.”

She doesn’t slow for a moment slamming into the two of you like a jackhammer. “So you won’t beg me eh? Then feel my full power.” With a final wave of her hand you feel a second massive cock enter your pussy and stretch the walls of flesh between your pussy and ass as the third and fourth cocks spring from her body and fill you and your twin. “Now bitches, you will beg for mercy or die!”