Maisie is Neo's girlfriend but at that time, she saw Neo at the club with Erina. Even Erina was pregnant Neo's child

Maisie felt hurt but she held it in until she left the club. When she got home, she was faced with her father's problem, namely crashing a car and stealing Neo's father's property, Alexander.

Albert, Maisie's father immediately sold Maise to Alexander as compensation because he had no money.

Maisie immediately agreed and they got married and immediately had sex at the hotel.  After getting married, Alexander invited Maisie to live with Neo and Erina who was already his wife. 

How is the next?

Marrying My Ex's Father all 28 chapters