Does the emission of semen after thinking about masturbation invalidate the fast, and what should be done to stop it? Is the clear, viscous fluid that is emitted merely by imagining it considered semen? Is merely imagining masturbation forbidden?

Emission of semen through thought does not invalidate the fast according to the majority of scholars. However, practicing the forbidden act of masturbation after nocturnal emission due to thought invalidates the fast and necessitates making up the fast if semen is emitted. If semen is not emitted, the fast is not broken. If semen is emitted involuntarily while reciting the Qur'an without any intervention, the fast remains valid. It is recommended to avoid arousing thoughts, occupy free time, strive for marriage, and supplicate to Allah.