In Netorare, the partner usually are unwilling (Although able to be aroused by the circumstances) and felt regret, sad, and anger about the situation.
But in Netorase, the partner are actually wanting and willing to make her to have sex with other people. It's basically a willing cuckold. The partner pushed the female MC to other stranger and felt pleasure from seeing them. It's the ultimate Masochism.

Anatidaephobia is defined as a pervasive, irrational fear that one is being watched by a duck. The anatidaephobic individual fears that no matter where they are or what they are doing, a duck watches.

Anatidaephobia is derived from the Greek word "anatidae", meaning ducks, geese or swans and "phobos" meaning fear.