That's Netori.
The key difference between Netori and Netorase/rare is where the protagonist falls in the equation.
- If the protagonist is the one stealing the lover, it is Netori.
- If the protagonist is the one whose lover is being stolen from them, that is Netorare/rase.
Diving a little deeper, the key difference between Neto
rare and Neto
rase is
consent.
- If the protagonist is either unaware of cuckoldry, or is distraught or otherwise does not consent to it, it is Netorare.
- If the protagonist is aware of the cuckoldry, but does consent (or for some reason does not care, I believe that also applies), it is Netorase.
Please take notes, for this will be on the test.
(Just kidding.)