i only see the people naked,i see 0 sex scenes

I mention this in the "Approach" section, but the game is mostly text-based; many sex scenes with Theresa are drawn, but the game generally just describes sex. Besides the fact that I'm still building my art skills, that approach lets me make complicated and hot sex scenes with a lot of different options and not have to produce a whole bunch of art. Ruin Me leans more toward the "novel" side of "visual novel" compared to other explicit erotic games.

but i was supposed to see nothing during 2 trains of theresa or i got something wrong??

The first level of training for each stat doesn't have special scene art, so there shouldn't be anything wrong there. You should start seeing scene-specific art on the level 2 trainings.

I may go back and add more art to the earlier trainings at some point, but even later in the game there are only a few specialized poses for Theresa.