Peyton and chris are long-time friends who have just transitioned to a "friends with benefits" relationship. if their friendship truly comes first, sternberg's triadic theory would suggest that their relationship is but not

I believe the answer is: intimate; passionate

A relationship is considered as 'intimate' if each persons shared somethings that they consider as 'personal' and not most commonly known by other people.
The relationship could only be considered as 'passionate' if it also follow by a sense of lust/sexual desire and commitment toward one another.