The kiss comes towards the end, but the sexual tension is kept high throughout the story. The thing is...once they have the kiss, they don't stop there and go aaall the way. It surely gets hot around and the scene is pretty "detailed" in the novel, so if they want to make this into smut, they sure as hell have the material for it. But I don't know if they would depict it here as spicy as the novel.
https://www.wattpad.com/story/359059320-just-twilight-hanya-fajar-end
It is a fan translation and you need to use autotranslate on it which has a tough time with pronouns. So you get confused most of the time who is doing or saying what, but if you read slowly then it becomes easier.
I WANT SPOILERS