The premise is not new, but it is well handled.  However, I would suggest
that you run your fics through a spellchecker and check the grammar before
posting.  

The opening in part 1 was well done, creating a depressive atmosphere and
the story flows well.  But I think you rushed Ranma's introduction into the
Tendo household.  At the very least, Soun should have had more histrionics
about the impossibility of joining the two schools by marriage.  

I am puzzled about three matters.  It seems as though Ranma still doesn't
recall her past association with Ryouga in junior high school.  Wouldn't
Ryouga remind her?  Why does increasing Ranma's breasts change the
perception of her from average to stunning?  Even with bound breasts, she
would still have the same facial features.  At the very least, she would be
considered cute.  Why didn't Ranma hurt Kuno more?  She broke arms and legs
of other boys and Kuno was the main instigator of the attack.  At the very
least, I would think that she would have broken his wrist.  

Looking forward to further chapters.  

                                                                   dml