Lucius Malfoy and Lilly Evans child

Lilly Evans was married to James potter and just had a son with Harry the next night they made love but James went to sleep straight after Lilly feeling like he doesn't think of her as he used to goes to a bar were she sees Lucius Malfoy who was drinking because he just had love with narcissa and she didn't do anything that she usually did and felt like she was cheating on her they both feeling alone made love and had a secret relation ship right after that night Lilly became pregnant and had Rebekah a beautiful baby girl who looked like her and Lucius though Lucius sent a note that he will see his daughter as much as he can she felt safe James felt uncertain she was his but Lilly made up a lie saying she looked just like her great grandmother he believed that and thought she was his when Voldemort tried going after them he made a spell but it gave Harry a scar but it made Rebekah have super strength and speed faster then a vampire and hearing and sight faster then a vampire but would bleed and get hurt but it would heal and when she turned 17 she would never age again and she couldn't be killed