Last year I posted chocolate sweet heart cookies and molten mocha cakes, which are sublime, and make great Valentine's Day desserts. Give them a try.
If you are looking for a lighter Valentine's treat, how about these mocha chip meringues? They are only 23 calories each and have very little fat, but they are incredibly chocolatey with a hint of coffee. I could eat a dozen of them! I shared some at work and they were SO popular -- even the people who said they don't like meringues liked these. Note: instead of using instant espresso powder, I used the same amount of instant decaf coffee. This recipe does not use flour but does use cornstarch, and is a good choice if you're sensitive to gluten (just make sure your brand of cornstarch is considered gluten free).
Another "lighter" version of a chocolate dessert are these triple chocolate brownies. Making them a little healthier than standard brownies is a secret ingredient: pureed black beans! They replace about half the butter found in regular brownie recipes. My husband and I love nuts, so I added 1/2 cup chopped walnuts for added protein and fiber. These brownies are amazing -- moist and very chocolatey. With 155 calories per brownie (yield: 16) and 7 grams of fat (4 g saturated), you don't have to feel too guilty enjoying this treat.
I hope you try one of these wonderful recipes. Have a happy Valentine's Day!