progress_towards_intent_effect

progress_towards_intent_effect = {
	if = {
		limit = {
			intent_target ?= $CHARACTER$
			has_activity_intent = woo_attendee_intent
		}
		progress_towards_lover_effect = {
			REASON = $REASON$
			CHARACTER = $CHARACTER$
			OPINION = default_lover_opinion
		}
	}
	else_if = {
		limit = {
			OR = {
				AND = {
					intent_target ?= $CHARACTER$
					has_activity_intent = befriend_attendee_intent
				}
				$FRIEND_FALLBACK$ = yes
			}
		}
		progress_towards_friend_effect = {
			REASON = $REASON$
			CHARACTER = $CHARACTER$
			OPINION = default_friend_opinion
		}
	}
	else = {
		reverse_add_opinion = {
			modifier = kindness_opinion
			target = $CHARACTER$
			opinion = default_friend_opinion
		}
	}
}

As written in game/common/scripted_effects/00_relation_effects.txt.