When writing a sexy story, always keep in mind scent. Scent is a very powerful aphrodisiac and draw people together. It can trigger feelings of sexual excitement, passion and intensity.
Think about your favorite smells and what they mean to you. You ex boyfriends cologne. What do you feel when you smell it? How about your current boyfriends cologne? How does that make you feel?
Think about your favorite sexual encounter. Was it on a fling or what type of situation was it in? If if was a one night stand, you might have smelled the stale alcohol from the club in the morning, that can trigger feelings of sexual arousal for some people. After shave is another popular scent because it means that they guy is clean, prepped and ready to go.
If you incorporate scent into your story line, the simple act of describing scent will cause the reader to pick up on your cues and imagine the smells themselves. When you describe scent. you want to keep it with the theme of your story. I will go back to the stale alcohol. Many people might think that this makes no sense but in fact, the stale alcohol can describe raw, animal sex. Uninhibited, taboo and bad. It can run with the theme of your erotic story.
A suggestion I would recommend to use in your sex story the scent of flavored lubricants. The smells are very sweet and erotic, they are made to excite the sexual mood so this is an easy way to be original in your story with a erotic scent and it will be easy to describe. Most of your readers will be able to relate to the delicious smell of flavored sex lube and for those who don't know, they might even be tempted to give it a try on their next sexual encounter.
Another sweeter scent could be scented candles. It tends to be over done so I would avoid this but if you are a novice erotic author then the candles are easy to describe and help to set the mood. Try not to stock with the candles because like I just said, they have been overdone and are not original.
This brings up my next point. Think originality. Your scent can be the fresh nail polish from t eh girl who just finished getting herself pretty for sex. This means that she is freshly shaven, freshly styled and ready to go, fresh like a newly picked apple.
When you describe scents, it will really enhance the mood and draw people into the story by making your readers really get involved and feel one with your sexy story.