can sombody mod this game so the mc turns into the dude that does all the sexual stuff XD ?
I don't think that kind of modding is possible or worthwhile, but I got the next best thing for you if you liked this game.
I know an extremely similar game to this one minus the NTR.
The title of that game is "Harem Fantasy" (RJ178610)
It has three girls and a male MC. And just as you've guessed from the game's title, all the girls want the MC's dick since it is a harem. There's even girls outside the group that you meet later on that has sex scenes with MC. It is literally the same as this game but with different artstyle, it even lets you name the MC.
I finished this game months ago, but if you end up playing it and need some assistance, then don't be shy to ask~