Game mechanism didn't change, but you did confuse a thing or two. Game can be played with NTR off, and NTR on. Each girl has three stats, love, corruption, and relationship. If you play
with NTR on, you need to keep relationship high, in order to avoid being NTRed. Corruption points unlock content where you dominate and verbally degrade girls, love points unlock romance path with them. You can combine Corruption and Love paths, but one which has more points will set the tone of relationship, and you will not see some scenes from the path where you have less points. Also, on Corruption path MC can share girls if he chose so, but he can keep them for himself alone. Hope this helps.