I remember that! Pic is by Colossal_Beauties. I just went back to GC and found the original story:
"19 and in college, Abby was the top student of her class. She was never late, she was always respectful, and everyone just adored her. It was unknown why they chose her, why she was abducted and brought back as a giant woman, but something changed in that girl that no one could have ever seen. She was fully clothed and curious as to what happened, but after awhile of walking around the power was too much for her to handle, and she got wet the moment she came upon this huge city. She sat down and touched herself in her pants, and that's when she realized that being horny as a giantess was much more pleasurable than being horny as a normal person. She started to take off her pants, which was when this photo was taken. Unfortunately for everyone, soon after she was fully nude and started fucking everything in her sight. this town was doomed the moment she set eyes on it."