note Proposing this to distinguish the 'Oneesan' archetype from the literal 'big sister' tag. While 'big sister' implies a familial role, 'oneesan' is a specific cultural trope regarding age seniority and social dynamics (like a neighbor or senior student) that does not have a direct English equivalent that isn't an opinion word. This helps categorize galleries where the focus is on the woman's seniority rather than the 'shotacon' genre