Holy Crap?! My Sperm Donor is a Billionaire

Weston Hewitt's marriage certificate is a fake, and the person holding it is Emily Winter. The registration he actually filed was with Tanya, the housekeeper's daughter, and he filed it to keep her happy. Emily learns all of this by accident. A dog chews up her certificate, she takes it to the registry office for a replacement, and the office tells her the document was never real. She turns around and goes straight to the country's top university, picks out a male student she judges suitable, and sets about having the Winter family's heir by him. The student is Jason Lewis. What Emily does not know about him is that he is the heir to the Lewis Group, which puts him among the most powerful men in the country.