I'm sorry to hear that. My view is that stories which include bodily functions at some point are far more realistic and believable than ones which are simply about non-stop sex for hours on end.
Big boobs and big penises seems the way to go. Although, maybe make it include a magic element, scientific (sci-fi), or accidental. Hell maybe a genie lol either way the protagonists should prolly start out normal and end up a certain way. If there are antagonists it should be the same either their assets are taken away, or increased to a point where they are really unusable or used for something devious.