Try all monsters. You+cat/dog/Cece/Elf/Cow and Cece+Cat, Worewolf+Cow/Cat.
I cannot found missing combinations, You must have turn on ''show animations''
for the combo anims you're missing you need to raise each of the previous girls' affection to unlock them (ex) raise cece affection to ~330 same for catgirl, doggirl and elf
