Hmm. Well in my opinion this one is not a good candidate for bottle priming. With a FG of 1.025, there is enough sugar left to carbonate the bottles several times over if you put active yeast in there that can handle the alcohol level/pH.
The most likely sceario, if you add yeast, would be that nothing happens. It's hard to get yeast going in a finished mead. You might coax a small amount of activity out of them, which might be enough to give the bottles a very slight fizz.
If, however, you succeed in getting a healthy and hungry bunch of yeast in there, you will probably end up with exploding bottles. Once the mead starts refermenting, it will be hard to control the endpoint inside the bottles and it could go way past your intention of "sparkling". Like I said, 1.025 is enough to create several times more pressure than you need, and will definitely be enough to crack glass.
If you want to give it a try, I suggest you do the sparkling bottles in something like a plastic soda bottle (2L size works well). Mix in the yeast, you can skip additional sugar, and fill the bottle. Squeeze out the extra air and cap. When (if) the bottle becomes firm from the gas pressure, refrigerate immediately. Consume promptly, as you won't guarantee that the yeast will quit in the cold. If you are dead-set on using glass bottles (which I HIGHLY recommend AGAINST), be sure to put them in a secondary container (like a plastic bin with a lid) in case of detonation. Handle with extreme care, preferably with safety goggles and thick rubber gloves too. I would suggest long pants and long sleeves. Flying glass shards are bad. Don't risk serious injury for a few bubbles.
If you have an alternate way to carbonate besides "natural" carbonation via yeast, that would be a better way to make this mead bubbly. Force carbonation with a keg setup or bottle carbonators are good options, like Wade said.
In the future, if you would like to make sparkling mead, plan for a must that will reach about 11-12% ABV and ferment completely dry. You can prime and bottle to create a dry sparkling mead. Sweet sparklers are more difficult, and you can search the forums for lots of opinions and attempts at those.