His Private Mistress: Harlequin comics

Amelia is visiting Monaco to attend a friend's wedding when, by chance, she bumps into Toby Haynes. Amelia had already been lost to his charms once before—falling into bed with him—but realized right away that it was a mistake and left him the next day. Now, however, Toby seems to have plans to seduce her once again, and things start to spiral out of control. If she becomes serious about a thrill-seeker like him, it will destroy her! Though she's resolved not to get too close, Toby's attractiveness tugs at her heart. But she never intended to touch what was behind his playboy mask...