Grandfather! If you're going to fuck me, don't end up inside

Submissive teenager allows her grandfather to fuck her only on the condition that the old man does not end up inside her so as not to have a child from him. She is aware that the old man has fed her all her life and has struggled to give her studies and good clothes. Now that her grandfather is very old and unable to work, she gives back to him what he has done for her. One day the old man gets up with a happy cock, the old man wants to fuck but paying a whore for the pig or finding someone to unload his balls is very difficult. The girl makes the decision to fuck him, letting himself do everything for the old man, just putting a limit and that is that the old man does not end up inside his shell.