Finch and Violet drive back to Finch’s house in the afternoon. His bedroom is now blue, and Violet feels like she’s in a swimming pool. She showers first, and then Finch showers quickly. He returns to his bedroom in his towel and says that Violet never asked what he was doing on the belltower ledge. She asks him in a whisper. Finch says that he was doing exactly what Violet was: he wanted to imagine jumping off, but he didn’t like what he saw. And then he saw Violet. Finch spins Violet around and then pulls her close. She realizes that his towel fell, and she allows her own towel to fall and kisses him.
This passage heavily implies that Finch and Violet are going to have sex. It’s telling that this happens after Finch and Violet finally put into words that they were both considering suicide on the belltower. Speaking truthfully and putting their dark, scary thoughts into words brings them closer together and takes their relationship to a new level.