Is it obligatory for one who committed an inappropriate act with a child who is a forbidden relative (mahram), and then committed the act again after puberty and repented from it, to receive a hadd punishment or a ta'zir? And does the punishment fall away with repentance or due to the child not being subject to ta'zir? And is the punishment multiplied by the multiplicity of the act or not? And have similar incidents occurred in the Prophet's سيرَة (Sirah) or during the era of the Companions?

Sincere repentance erases all sins, even polytheism. If a person commits an indecency that necessitates a prescribed punishment (hadd), it is legislated for him to conceal himself and repent to Allah. Ta'zeer (discretionary punishment) is a legislated punishment for every sin for which there is no prescribed punishment (hadd) or expiation, and it is not obligatory except after the matter is brought before a judge. Repeated commission of sins that necessitate ta'zeer, committed against the rights of Allah, warrants a single ta'zeer punishment. A child is subjected to ta'zeer for disciplinary purposes. Good deeds efface evil deeds, and Allah has forgiven those who prayed and repented.