Sometimes it's hard to believe there are some really dumb people in this world and my step-mother is one of them. She's a selfish and futile person completely obsessed on not getting old at all costs, that believes, or wants to believe everything she reads about the subject. As a prank I've made a fake web page explaining the amazing benefits of men sperm to rejuvenate human skin, specially wrinkles on the face and neck, and I showed her my discovery. She got really curious and started googling about it. Obviously she didn't find anything more about it but I'd knew she would be curious enough to try it so I offered my help to cum on her face, since it has to be done at least once a day and my father is not always in the mood.