I don´t own Harry Potter or any of the series´ characters.
In this story Harry and Cho neither kissed at Christmas nor did they broke up after Valentine's Day. Also Cho came to the DoM instead of Luna.
"No", thought Harry "I can´t let this memories disturb my concentration." With this Harry pushed the memories of his dates with Cho aside and continued his fight with Voldemort.
Cho cried because Harry Potter, her Harry, fought against Lord Voldemort and there was nothing she could do to help him due to some kind of invisible wall summoned by one of them. She pressed her face against that wall as she watched amazed how good Harry stood his ground. Cho turned her head left and looked at Professor Dumbledore who whispered inaudible words, than the other way to look at Ron and Ginny standing together with white faces. "Please Harry, you have to survive" thought Cho. Then it happened: Harry, one second to slow to dodge Voldemort´s curse, flew against a wall and was lying on the floor, with his face down. Voldemort smiled and snapped his wand at Bellatrix who immediately stood up.
"Harry NO!" screamed Cho the same moment Harry fell down. She fell down to her knees but felt something rising inside her. It was pure, burning rage. Without realizing what she did, Cho got on her feet and stepped forward, right through the invisible wall. The sound of her steps made Voldemort and Bellatrix turn her direction. Bellatrix pulled out her wand but Cho was faster. She screamed: „Stupefy!" pointing her wand at the death eater. Bellatrix´facial expression went from gloating to shocked as Cho's charm broke right through her shield and knocked the death eater out. Angrily Voldemort snarled at her: „How?" Cho, her eyes still filled with tears replied: „You can't stop the rage of a loving woman" and shot another shocker. Voldemort shielded himself while laughing and used his own curse, missing her by inches. He then dodged a whole bunch of shockers by apparating next to Bellatrix.
Deciding to finally end the duel he pointed his wand at Cho and said: "Avada Kedavra !" Cho raised her wand instinctively and screamed: "Protego!" deflecting the spell right back to Voldemort. He appeared to be surprised but quickly grabbed Bellatrix' arm and disapparated, two second before the curse blasted into the wall where he stood, leaving a small crater.
Cho immediately ran to Harry who let out a small groan. Turning him around she took his head and started to softly rock it. Harry opened his eyes a little and grabbed Cho's hand which was already holding his. He said; "Thank you, Cho." but she shook her head and pulled his closer. She bend down even further to touch his lips with hers. While kissing Cho felt Harry's grip tighten and put even more of her love into the kiss. As they parted Harry said: "Cho I…I'm…sorry…" his last word a barely audible whisper. Suddenly his grip on Cho's hand loosened and his head tilted sideways. Cho cried out before collapsing next to him, overwhelmed by her grief.