Texan's Twins by Pamela Britton

Jasmine Marks is focused and hardworking, and when she took a job as engineer for Baron Energies, she left behind her support network. Now, the burden of caring for her twin girls is all on her, and she doesn't have time for a dilettante playboy like Jet Baron. Besides, she needs her job, and she can't blow it by getting involved with the boss's son.

On the surface, Jet Barron is a dabbler, dropping into work one day and riding rodeo the next. But when he makes his mind up, he goes for it, full-out. He knows a lot more than anyone suspects, about the oil business, about women. And this woman needs someone to count on—which will be Jet, if he gets his way.