Nikaah & Marriage Issues

Marrying one's milk sister

Q: I wanted to marry a girl but later they told me that her mother breastfed me once when I was less than one year. I researched about it and according to my knowledge in Quran it is forbidden to marry but there is no evidence of how many times of breastfeeding is required. From hadith I found that there is one hadith from Hazrat Aaisha (radhiyallahu anha) which states that five breastfeeding is required to make it haram. Please guide me regarding this issue.

Advice to give up masturbation

Q: I am a severe porn and masturbation addict. I have been struggling with this for many years. I used to watch porn and masturbate 2 times a day. It's a 10 year addiction and I am still suffering from it.

Now I am facing real consequences in my life. I have lost my studies, my career has been down hill almost over and now I feel like the divine consequences are getting more severe. It's like Allah is slapping me and each slap gets more severe. I am being exposed, humiliated, troubled also completely lost. Please make dua for me. 

Using a duff in a wedding function

Q: A person I know is getting married, so they are hosting a party where we will gather and eat. The duff will also be played in the party. The party will be women-only, but I'm having some doubt on the duff part. 

Is this within the boundaries of permissibility to use the duff? Also, I think they will use some speakers so that the duff is louder.