Pastries with "lava"-style filling, anything with free-flowing liquid that can evoke pussy juice
Syrup or honey, often shown dripping from the ceiling or onto fingers
Objects that have a perforated opening and can be pulled open from the sides (such as clams) tend to evoke a spread pussy
Flowers, especially lillies, due to their association with femininity and their reproductive habits (and since "yuri" is the Japanese word for "lilly")
