Venus Cancer and Pisces Venus are both made of the water element and so the expression of love and feelings here is often of a nurturing kind. These two may be sensitive to each others' feelings and emotions. And by providing a means for each to express what is in their hearts, is the way in which they show love.
Water types(incl Sun,Moon,Asc,Mars) show they care for you by anticipating what you need, how much and when-before you even ask.
Cancer is caring and sensitive. Pisces is gentle and receptive. So this is a lovely mixture of empathy and kindness making up a large part of the interaction with each other.
Unless Fire Asc/Sun/Moon or Mars, you will not find these two shouting at each other or exchanging insults.They can also often even sense how the other is feeling without words
There will be a lot of nonverbal prompts, communication and gentle caressing -as if babying each other.
In fact they may even adopt baby names for each other(if other aspects allow but may hid this in public)as they will love spoiling each other and tending to each others' needs.