Reluctant Mistress, Blackmailed Wife: Harlequin comics

Katie is a single mother with two twin babies. Having lost both her job and house, she decides to swallow her pride and ask the father of her twin children for help. Alexandros, the father, is a millionaire and president of a large bank. Katie loved him body and soul, yet he played with her feelings and dumped her in no time. It has been a year and a half since he dumped Katie, and he does not believe her words when she tells him about the children. Instead, he coldly tells her, "You need to get a DNA test. I'll take responsibilty if they are mine."