Strong temptation.

Yesterday I met with my friend. We hadn't seen each other for a long time, so we were very happy to meet at last. While we enjoyed spending time discussing our news and gossiping about men, her phone rang, and I discovered saw that the case for her phone was in the form of was made to look like chocolate. It looked so natural that I waited to see her palm soiled with melted chocolate at the next moment. I even felt that sweet taste in my mouth.
After that I ate the whole chocolate bar, and of course felt guilty. No! Chocolate is too strong temptation for me, I can't resist.

Very few errors. You're a good writer :) I corrected some comma errors, but the only other corrections are mostly superficial, to help the sentences sound more natural - more like a native English speaker. 

Also, I too love chocolate far more than I should, but I never feel guilty after eating it. There is NOTHING wrong with eating chocolate (I tell myself).