They were soon going to go horcrux hunting and Hermione had to do something to keep Harry and Ron together, she didn't realise how eagerly they will accept her offer. [Evulchibi]
Hermione and Luna find themselves in a sticky situation when they are ambushed in the Forbidden Forest. Things take a turn when Hagrid is stung and infected with a potent aphrodisiac. (The Merry Mage) [Harry Potter] Link in comments.