Ben
You: Babe, Love, Princess, Flower

Him: Babe, Weirdo, Watch-Boy, B

.
Kevin
You: Baby, Babe, Babydoll, Sexy, Pretty Lady, Princess, Beautiful

Him: Babe, Hot-Stuff, Kev, Good-looking

.
Rook
You: Sweetheart, Dear, Darling, (Y/N) (he often just uses your name)

Him: Honey, Love, Dear