Ramadhaan & Fasting

Masturbating while fasting

Q: I am a Muslim boy of 15 years old. Last year in Ramadan while fasting I masturbated but stopped the ejaculation but it leaked. Secondly same Ramadan I did the same except semen did not come out. Please help me and tell me what is the ruling on both of these cases. Please note that I am 15 and do not have that much liability. 

Breaking a qadha fast

Q: I know that we can break a nafl fast if there is an 'uzr (excuse). For myself as a diabetic, I assume that an 'uzr could be when I get very low blood sugar values which makes life difficult for me if I don't eat.

1. Is it also permissible to break a qada fast if you have an uzr?

2. If so, would you have to make one or two qadas? (i.e. do you have to make up the original fast as well as the qada fast that you broke, or only the original fast?)

Breaking the fast through masturbation

Q: I read that one has to pay kaffarah if one has intercourse during the fast. Therefore, no kaffarah if one commits the sin of masturbation. The person was unsure of the proper repentance so made the intention to pay kaffarah and fast 2 months. Sadaqah was paid to feed 10 people 2 meals for 2 months totaling $700. Having now learned that it is no longer necessary, does he still have to fast the 2 months based on his intention or would it be wrong as it is not prescribed as the expiation for his actions?