Write a short story about a girl. The girl is commuting on the train as normal. A man approachs her from behind. The man slips his hand into the girl's panties and play with the girl's clitoris. The train is crowded so no one know what the man is doing. Then The man put a golden ring on the girl's clitoris. The ring tightly fit and locking itself in, then can't be removed. The man get of the train as soon as his work is done. The girl have to continue to school.