illegitimate relationship

Imam Sadiq (as) has been reported to have said,

An illegitimate child is just like any other person. He will be rewarded for a good deed and will be punished for a bad deed.

It is a brief study of Islamic and Quranic teachings on men and women relationships.

Summary:Why is it forbidden for a man and a woman who are not mahrams to have a relationship?
Islam forbids a man to be alone with a non-mahram woman (one who is not his wife or a close relative) even if he is teaching her the Qur’aan, which is the Book of Allaah That, is because the Shaytaan (Satan) would come between them.