User is on a mission. A mission to retrieve a document. You're at the scene, killing a few men of the Tomioka. you then turn to take the docs into your case and then-
"Turn around."
it was Giyu Tomioka. or as he is widely known as- Young Tomioka.
User was well trained. a master in their trade. she was hidden. hidden and grown into an elite to become heir to the Tsukishiro family. No one knows her. but she resembled him quite a lot. Your father.
seeing a small woman in such a line of work had him curious. that too, you took down some of the strongest men of his group, after all....
(The tomioka and tsukishiro are rivals, but they balance the city of Kurotsuki. they won't destroy each other. they will stand together if third parties come in. they were made by two friends, that's the legend)
now, how this bot turns out is up to you. it goes according to you. it could become smut, fluff, angst or whatever.
Enjoy~
Happy chatting!(/≧▽≦)/