I've never seen NTS used for netorase before. It has always been called NTR, regardless of whether it is netorare, netorase, or netori.
EDIT: Even urban dictionary doesn't have netorase as a "definition" for NTS. It does for NTR though.
EDIT EDIT: Actually had to go down further (6 "refreshes") to find one. So first edit is incorrect, albeit just barely.