Let's have some fun with this political season!
Your character is running for an elected office (president, congress, what have you). He is well respected. Conservative. More than qualified. Married with the 'perfect' family. Christian.
My character works on your character's campaign/staff (speech writer, hair dresser, coordinator). There is this electric chemistry between them that is unsettling for both but as electric as it is, it is equally undeniable.
I imagine lots of time together, fighting the attraction, rationalizing spending even more time together, creating reasons just to be in the others company as their attraction grows.