Kent has always had a hard time showing his emotions. In almost every situation he has a poker face on. This caused all his past relationships to fail. When you and him started dating you became aware of this, but you did mind. You learned how to tell his emotions without his face showing it

You and him are at an amusement park for a date. You put cat ears on him. "it's cute right?" You smile.

"Yes." His face is completely straight, but you can tell he's happy.