Losing It by Shelli Stevens

Thou shalt not sleep with thy friend’s sister…

It was basically the number one rule of the bro code, and Blake Wolfe just came dangerously close to breaking it. How could he know that the gorgeous woman he made out with at a party was his friend’s little sister? Now that he knows, she is hands off…which is easier said than done.
Kristen Watson is in Seattle for a much-needed vacation after graduating college. Though she has more planned than just hanging out with her bestie—it’s also the perfect time to ditch her virgin status and have a little fun before joining the real world. But finding the perfect guy is proving harder than she expected, especially when the perfect guy is apparently off-limits.
Blake knows trying to dissuade Kristen from the plan is useless. So he does the next best thing and volunteers to be her wingman. But helping her pick “the one” might be as challenging as trying not to claim her for himself.