EX:
"As the rain drummed its quiet tattoo on the tin roof, I approached the wood-grained bedroom door and stared at my distorted reflection in the doorknob. My mouth suddenly dry, I opened it and licked my lips. My hand moved from the side of nightie, opening my trembling fingers -- the same fingers that had teased my body to the edge of this precipice -- the forbidden border to cross. I touched the cold knob, grasping it and turning it slowly, carefully clockwise. The gears within clicked -- it sounded so loudly, I was sure that it would wake my sister. But two seconds of pause assured me that she was still breathing deeply, soundly in dreamland. I pushed and with a quiet whoosh, the door opened, revealing the darkness of the hallway. The mustiness of the old house drifted to my senses and I crinkled my nose."
See? That was just opening a door. It might end up in the final edit as:
"She opened the door."
And it would accomplish the same thing in the overall scheme of the story. But in a first pass, its good to overwrite, then balance your story in rewrite as to what is important to the tale, and what needs more and less emphasis.
A quick word about pacing the scene. Unless your scene is some kind of brutal, sudden rape, then you may wish to consider a slow build, teasing the reader (Yes, the characters are teasing each other, but itβs the reader you really need to be considering here). Little, subtle things occur first -- a button opened, a wry grin, a shiver or a tremble of excitement -- all slowly building towards some inevitable occurrence -- intercourse, oral sex, masturbation, voyeurism, or simply, a touch, a look, or a kiss.
If you've set the scene up well, then the reader has some expectations as to what may happen. With any luck, you will make something happen that is not on their expectation list, but is just as hot. In this way, the read is paid off, not disappointed, but in an unexpected way. This is the best possible scenario for the writer. Your scene will not be predictable, but will satisfy none-the-less.
For example, the reader may have been set up to expect an incestuous encounter between a brother and sister, and now for the first scene when they are alone together on a rainy afternoon, talking. If you want a slow encounter, you might have them talk about anything -- the weather, mom and dad, their upcoming trip -- but have the subtext, how they dress, how they move, how they express themselves as being a subtext that says these two people want to fuck each other. A strap falls from a shoulder, a zipper bulges, a crossed over leg bounces as she giggles embarrassingly -- you get the picture. But in the end of this first scene, all the reader knows is that something big is coming. They didn't fuck; they didn't kiss (maybe almost). Perhaps they didn't even touch, but something is coming.
In the next scene, you need to take the situation further, don't cross over the same ground the reader has dealt with before. Continuing the brother-sister example: Maybe in their next scene, the siblings are home alone again, but now they are playing a game -- Monopoly or something, so they are more at ease with one another, they're talking, interacting. Perhaps they are dressed more casually. He is now in gym short and a tank top. She's in pajamas. Take the sex a little further -- an accidental flash of her breasts, describe the muscles in his legs all the way up to his⦠Well, you get the idea. By the time these two actually have sex in this scene or the next, the reader should be right there with the characters emotionally. "Yeah! Let's do it!"
Pace your story according to the emotional level of the characters. If he's a rapist, aggressive, sexually repressed and horny as hell, the sex will be over quickly. Your story will likely lie somewhere between the slow encounter of the brother and sister described above and the sudden rape story.
Remember, present every detail of your story, writing front to back using all of the senses, then edit for emphasis. Pace your story according to the emotional level of your characters and you'll do fine.