Introduce a Toy
The "toy" in this case can be anything. It can be grabbing an old tie and using it as a blindfold and/or makeshift handcuffs. It can be grabbing ice from the freezer and teasing your partner with it while they can't see. It can be lighting an aromatherapy candle and dripping the wax-turned-massage-oil on your partner. It could be watching a pornographic video together. Or it can be an actual toy,free porn such as a vibrator. If you use a toy of any sort debrief afterward. Were there things your partner liked or didn't like? Often, that element of "new" adds a bit of excitement; don't be surprised if your partner likes it enough to ask for it be worked into your regular sexual repertoire.