They are more as similar to the unicorns where a unicorns of opposite sex while finding each other. Like the destiny of the wish of a person grands to himself to meet alike a person of similar interest.
Dicorns (unicorn having two horns), (kirin)
The bicorn is a mythological two horn creature due to its variation in the depictions it’s possible this creature has some shape shifting abilities.
I think they are perfectly fine together. Dicorns makes a wonderful and strong relationship so that the swinging balances and love becomes stronger.
Diornas are incredibly beautiful, which is why they are so rare. They are quite aggressive, but it's only because they care about the people around them. If you know a Diorna, keep her happy, because she is easily distracted.