Based on that one part in the sixth book in which Hermione, as usual, is answering all the questions Slughorn throws at the class.

"Ron," Hermione began a little breathlessly, "I have a confession to make."

"What is it, my love?"

Hermione cleared her throat, a little embarrassed. "Well, you see...remember that time in potions, when I was talking about what I smelled when I smelled Amortentia?"

Ron thought a moment. "Yes," he said finally. "I remember you cut off after parchment and cut grass."

"Well," Hermione continued, biting her lip. "The other thing I smelled...was you."

Ron took her in his arms. "Oh, Hermione," he murmured into her halo of brown curls. "I smelled you too."