Eh, I'm not gonna google everything for you, since I already had to do the work and look up the links for the last post. Honestly, both of your questions are fairly easy to do the research on.
But NTR an anime fetish, basically cheating (not cuckolding). The differences between the two definitions of NTR (some would argue there are three, but for the sake of time, I'll explain two) is perspective. "Netorare", is the more common one, is where you (or an MC) is cheated on, for example someone stealing your love interest. "Netori" is where you steal someone else's love interest.
A Zombie's Life and Zombie Retreat are the two most posters think of when they think of Scarlett Ann, the artist. She's done Prince of Suburbia and Saviour's Quest as her game credits, and MILF Airline (and others) as general artwork/comics.