I had a bigger sister who used to love me and I loved her too. But before some days she knew that I used to drink. But at same night I found that she had sex with a bad person (likely called playboy in our area). We have not seen each others face since that night. I know we both did mistake but what should I do now please help me I'm so confused.

You should do nothing but see your sister and not talk about it. If she has sex with a dozen "playboy" it really is none of your business unless she asks you. And if you drink that is not her business.

No idea why you would let this come between you.

Hopefully you both learn to stay out of each others personal business and just love each other. I think eventually you will even though emotions are high now.

Do nothing and the dust will settle and you can get beyond this, or at least start trying to parch the rift.