You actually can see Natalie with the beach guy, but it's not very easy. Natalie needs high lust, you need high voyeur. Then, you need to take a walk instead of waiting at the bench, and if all goes well, you'll hear "something" and can go take a look.
And yeah, there will stuff that people consider NTR. Stuff like Natalie's beach date, security cam of the girls' sessions with the customers and other types of content where you're present while the girls have fun. But it's only one part of the game, so it's not a 100% focus on that :)
But hey, thanks for playing and leaving a comment!