✔ 最佳答案
Here is the word much closer to the word
"撒嬌",but normally used between a man and a woman, with a bit sexual hint.
flirt(verb)
1 behave playfully in a sexually enticing manner.
2 (flirt with) experiment casually with (an idea or activity).
3 (flirt with) deliberately risk (danger or death).
(noun)
a person who habitually flirts.
http://www.askoxford.com/concise_oed/flirt?view=uk
As for "一對一", if you are talking about you have a private student to teach in his/her home, then we call that "one-on-one tutoring".
http://leaptutor.co.uk/home.aspx
And "on by one" exactly means one after another,
http://bible.fhl.net/new/s.php?N=0&k=1527
以上,供您參考!