These sugar highs are only available for a limited time. 

Courtesy of Starbucks

If you need another reason to love Valentine's Day (besides the chance to celebrate your relationship and indulge in some chocolate), we came up with a few. From now until Sunday, these chain restaurants are offering special deals and treats that will take your holiday to the next level. So run—don't walk—to your local store to take advantage of these sweet offers.

Special Drinks at Starbucks
From now until February 14, Starbucks is adding three festive drinks to its menu. Each "molten chocolate" beverage infuses mocha sauce and chocolate chips with some of the franchise's traditional beverages. Rush to your nearest location and take advantage of the Molten Chocolate Latte, the Molten Chocolate Frappuccino, and the Molten Hot Chocolate. 

A Free Shake
Spend a romantic evening at Shake Shack on Sunday, and you'll be rewarded with a two-for-one milkshake deal. Just buy a shake for your date, and yours will be on the house. 

Ice Cream for One
No date on February 14? No problem. Dairy Queen is offering special "Singles Blizzards" to everyone flying solo on Valentine's Day. It's perfectly portioned for one person, and includes everything you want in an ice cream treat: cocoa fudge, peanut butter cups, and salted caramel truffles. 

Festive Donuts and Drinks
From now until Sunday, Dunkin Donuts is offering something extra indulgent—a White Chocolate Raspberry Coffee (or Latte). You can pair it with one of the chain's festive heart-shaped sweets: the Cookie Dough Donut or the Brownie Batter Doughnut.