That story isn't quite what i had in mind. Arranged marriage fics are neat, but you see almost as many of them as you do "motoko loses the duel and marries keitaro" fics.
I mean more the idea that sometime between her first duel with him and Tsuruko's arrival they fall in love in secret and decide to get married.
Hence why when Tsrurko shows up, motoko still does the same thing she did in canon, except this time she isn't lying.
But Tsuruko, due to the outbirst and her not knowing about it, thinks she is.
Que alot of the same hyjinks happening except, much to tsuruko's shock, they actually get though it. Now they are still somewhat shy about doing it in front of others, but they do do them.