Zoë Quinn - Cuck Tales

It is not always a fetish. From what I can tell "NTR" is the term that refers to cuckolding as a fetish. Cuckold is in general a term referring to when one partner in a relationship is unfaithful and the other partner is powerless to stop it, or has simply accepted the other partner's promiscuity as being part of their relationship because they've given up. In general it refers to someone who is being cheated on by an adulterous partner, with or without consent.

Needs one more guy in the helicopter, but otherwise perfect