Does semen discharge invalidate the fast if it is caused by prolonged, deliberate thought, or by reading material that incites lust?

The emission of semen due to thought does not invalidate the fast, whether the thought overwhelmed the person or was intentionally sought out by them. This is the view of the majority of scholars.

However, if a person intentionally reads something knowing that it will arouse their desire, then this is one of the things that invalidate the fast.

And if one reads something not knowing that it will arouse their desire, but then thought overwhelms them and they emit semen, their ruling is the same as the ruling for emission due to thought.