Hello! My idea is for an ordinary young couple, both probably in college, maybe a little jaded to slowly introduce spice into the bedroom. Your character wants to push the envelope and lead my character to a constant state of arousal and also increase sensations during lovemaking, including sex play training, anal training/stretching, bondage, fetish clothing, breast/butt enlargement, sensitivity increasing/decreasing. Maybe your character loves anal sex so much he only wants MC to take it up the caboose and gets pleasure through other ways, but can only get release through anal sex (after your training). You could be into stretching, toys, piercing, tattoos, etc.
Some sample story images
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Thanks so much