<report>Naze ka Kanojo ga Boku ni Ecchi o Sematte Kuru Ken is a nukige with a focus on non-penetrative sex of all kinds that the pubescents characters can think of. It builds up slowly and steadily, you won't get full on sex served on a platter here. Slowly, from hugging, to humping through clothes, to petting, to blowjobs, to fingering, to face riding, etc. With a timid and awkward protagonist, it's mostly up to heroines to push the story and the sex forwards. They all bring their own fetishes which they explore together with the protagonist. All the same time we slowly learn about the heroines, who start off as mysterious, but bit by bit we get to learn about their motivations and see the characters grow and their less-than-lovers special relationship change.

This VN is a great example of sexual tension building, give it a try.