Renting my son to his biological father

I am just a normal college student with No family , I live by myself.... or no. Not anymore! Now I have a cute baby to raise and I am happy with my little family... but ...on the birthday of my son, his biological father came to our home. He wants my baby just so he can stop marriage requests and blond dates fores by his parents. Whatever that's none of my business, he can't take my son because I am the legal mother of child by law and genes and he does not have any rights to take away my son even if he is the CEO of international business companies!
But ... why did things go wrong way? I have given birth to my son so why is my son glued to his biological father? Noway I will take back my son from this devil who attracted my son with his looks and wealth so at the moment I can't help but take his deal only until my son comes back in my arms!
Will she be able to get back the attention of her son that was stolen by this man or will things go beyond her imagination?