Is the emission of semen at the age of 13, before nocturnal emission, considered puberty? And will the questioner experience nocturnal emission after that? And does masturbation affect the timing of nocturnal emission?

The emission of semen in the manner described is considered puberty, whenever semen—which is the gushing white fluid—is emitted, whether during intercourse, sleep, or wakefulness. There is no need to be preoccupied with issues of wet dreams after this; rather, one should occupy themselves with what benefits them in their religion and worldly life, and strive for sincere repentance, because the pen of accountability has already begun to write.