How much of the game is NTR?
less than half. There is really only NTR with the Mom and Younger sister rn and maybe a bit now with the older sister now, i haven't played since the school election stuff.
oh and the cousin can be included with the younger sister for the FBI agent NTR stuff.
None of the NTR routes are as far along as the MC routes.
The younger sister's content is the only one that's close to parallel as
At any rate there is a lot of content even if you completely avoid the NTR stuff, which is fairly easy to do especially if you cheat a bit of money in the beginning