Just talk with the person after pretty much every mission after you have done their loyalty mission and always pick the upper left or right option when talking to him/her/it since the lower left/right is concidered the "rude" answers 
5 missions after I did Mirandas loyatly mission I had her in my bag already :) that is one pretty lady I might add, made after the hot blonde chick from the TV-series "Chuck"
If it isn't turnbased it isn't worth playing (mostly)
And shepherds we shall be,
For Thee, my Lord, for Thee. Power hath descended forth from Thy hand, That our feet may swiftly carry out Thy command. So we shall flow a river forth to Thee And teeming with souls shall it ever be. In Nomine Patris, et Filii, et Spiritūs Sancti. -----The Boondock Saints
