description to vague. Can't find. Do you have a link?
Hentai Visual Novel, Eroge, or any Visual Novel type games with ecchi/porn content.
Those kind of ecchi/hentai Visual Novel usually has quality scenario and dialogue for 18+ scenes, and therefore its a good inspiration
And also due to Visual Novel being moved at your own pace, and can be switched between auto skip/manual mode, it's easier to grasp and understand the whole scenario and therefore imitate than hentai/ecchi whoch moves at faster pace.