Does semen discharge suddenly after leaving a pornographic website, without looking at its content, invalidate the fast? Is this considered a breach of repentance from watching pornographic clips? Does this indicate a lack of fear of Allah in solitude?

We ask Allah to accept your repentance. You must completely cut off pornography websites, for whoever hovers around a preserve is bound to enter it. If your struggle with Satan did not lead to seeing something forbidden, then there is no sin upon you, Allah willing. As for the emission of semen merely by thought, it does not invalidate the fast according to the most preponderant opinion. We advise you to strive against your soul and distance yourself from places of doubt and sin.