She makes her fellow slaves pull out

Each time a man was about to climax after humping his fill--with no regard ever for her pleasure--she would make him pull out. Each man understood the need. Getting pregnant in the wasteland could be a **** sentence. Of course Madeline couldn't get pregnant with her vault birth control implant--but they didn't need to know that.

They would pull out suddenly and then finish themselves on her juicy ass, sometimes on her stomach or accidently on her vault suit or on themselves or on the ground.

Sometimes Madeline would use her hand to finish them off--always somewhere convenient that wouldn't messy herself up (except her poor hand).

One time, however, the supposed doctor couldn't pull out in time. Less than a minute after he entered her he was shuddering.

"Pull out!?" Madeline whisper almost loud enough to draw the guards.

He pulled out even as he came. Jerking his cock on her pussy--but too late.

After he was finished convulsing he apologized profusely. Madeline only gave him handjobs for the next few days of travel.