/jp/ - Otaku Culture

HF is an allegory for Sakura's sex life. When she was a young girl, Tohsaka Sakura was kidnapped from her home. Her family, after months of searching, declared her dead. In fact, however, Sakura was closer than they thought - she was sold to the Matou family, who ran an illegal brothel in their basement. Sakura worked as a prostitute every night for several years. This would help explain her submissive, non-confrontational personality.