Look at it from this point of view: perhaps he IS trying to sink in deeper, but she's very tight. He wants to crawl in feet-first like slipping inside a sleeping bag. Using her labia like a silky pillow, he'll keep his head out to breathe while her vaginal muscles will massage him peacefully to sleep. Her juices will bathe him and keep him warm, while his leg kicks and probing hands will cause enough motion inside her to give her a fantastic orgasm. Eventually she'll contract enough during her climax to unbirth him out in a warm puddle of her ejaculate.
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