When he steps into his physics class on the first day of senior year, Quinn Walker is too exhausted from staying up all night with his three-month-old nephew to deal with moral dilemmas. As a devout Mormon who has vowed to wait until marriage for sex, the last thing he needs is a very hot and very sexy Katarina Jackson as his physics partner. Regrettably, he has no choice.Kat feels invisible in her mansion of a home six months after losing her older brother in a fatal car crash and will do anything to get her parents' attention. Since her pastor father has no love for Quinn's "fake" religion and her ex-boyfriend refuses to leave her alone, she makes an impulsive bet with her friends to seduce her holier-than-thou lab partner by Christmas.