“…I remained silent, watching these two creatures become ever more enthralled with each other, watching them quite definitely fall in love.”
These two hadn’t met until Merrick since they are mutual friends of David who hadn’t seen Merrick since before Aaron Lightner died. Merrick serves as a replacement for Claudia it seems though I don’t mean to undermine his affections. They are like two young lovers in their brief while together, loving and tender, despite everything that happens while they are together: The Talamasca’s involvement, Louis’ attempted suicide, and of course Merrick’s death, not to mention that which Anne doesn’t mention (she skips from Merrick to Blackwood Farm and doesn’t mention the fates of David or Louis). This relationship moves fast and is short-lived and doomed from the beginning (no relationship that opens with an attempted suicide can be good).