Does unintended masturbation that occurs after touching the organ invalidate the fast, and what are the consequences of that in terms of making up the fast or expiation?

You must repent to Allah Almighty, for masturbation is forbidden, and it is even more forbidden in Ramadan. Similarly, speaking to a non-mahram woman with the intention of gratification is not permissible. You must make up for the day that was invalidated by the ejaculation resulting from masturbation, but expiation is not required.