Imperio
In the Department of Mysteries, while fighting the Death Eaters.
Bellatrix Lestrange hit Hermione from behind, "IMPERIO" she screamed. Hermione jerked backward her back arching as if in slow motion. She recovered quickly with a shake of her head she began to attack in earnest, "Come on Harry, and hand over the prophecy like a good little boy!" She threw curses over her shoulder at Luna and Ginny and they both doubled over in pain. "Hermione, snap out of it!" Harry yelled hoarsely.
"I am out of it now Harry dear, I am finally fighting for the right side. I'll serve the Dark Lord until the day I die!" she said with a maniacal laugh. She continued to fight for the Death Eaters throwing curses about her like flower petals at a wedding. Hermione had never been much of a dueler but under the imperius curse she was like a whirlwind fighting five people at once, firing spells faster than most people could say them.
"Mione, this is wrong! You should be helping us not fighting us!" Ron said to her. Hermione shook her head and coming out of a trancelike state said, "Ron what's happening?" Ron ran forward and kissed her hard before saying "Oh Hermione you were fighting for them." He then pulled her into another hard, long kiss.
"Oi, you two! Is this really the time?" Harry screamed over his shoulder.