All Out by Tawny Weber

Navy SEAL Zane Bennett can't walk away from a challenge. He's determined to win a bet with his brother—until he collides with the luscious Vivian Harris. Their attraction is immediate and searingly hot, but Zane can't bring himself to bow out of the bet. Now the game is really on…and Zane is embroiled in a wicked matchup he can't resist!

All In by Beth Andrews

Of the Bad Boy Bennett twins, Navy SEAL Xander is always the gentleman. That is, until he's challenged to go against his brother for a date with Quinn Oswald—the girl Xander's wanted since high school! It takes only one kiss for Quinn and Xander's deliciously sexy chemistry to explode. But how much is Xander willing to gamble…before he goes all in?