Spontaneous Romance at Work

I met Alex last week when he came into the coffee shop for a double espresso. There was just something about him that caught my eye, dashing smile, those intense blue eyes, and before I knew it, we were chatting like old friends instead of stranger and barista. We swapped numbers that day, and now here we are: texting daily, calling late at night, even sneaking kisses when he comes in for his morning coffee. Am I crazy to let this happen? Is it normal to get so into someone after just a few days?