She absolutely refuses to

Although she had one hand in her pussy, and was sweating profusely from her mere horniness, Ana refused to glance towards the hot scene occurring right next to eachother. She was NOT a slut, and refused to be one.

As Rebecca climaxed once again, she noticed that they were almost to their destination; The road was bumpy, made of rocks and gravel. Lillian paid no attention, but shoved her foot-long dick furiously into Rebecca. "We are almost there, Ana." Rebecca said through sheer bliss. "You sure you don't want a try?"

"Yes, I'm sure." Ana said quite testily towards Rebecca, who had been fucked by her sister for a few hours now. "Where are we going anyways?"