Sure Thing

Based on this prompt:

Because of his reputation (which initally came from nowhere) men have always assumed Kirk is a sure thing and have never tried to seduced Kirk... just used the old wham, bam thank you ma'am (or sir in this case)and have rarely bothed about his pleasure. (...)

(...)So suddenly Kirk finds himself being courted by Spock... at first Kirk thinks it is Spock trying to mess with his mind because Spock is still pissed about the 'cheating' incident but is soon disabused of that notion and he finds himself in his first loving, committed relationship in his life.