Answer

Based on the principles of Islamic Jurisprudence (Hanafi Fiqh), Hurmat-e-Musaharah (হুরমতে মুসাহারাত) is NOT established in the scenario you described.

Detailed Fiqh Analysis:

1. Condition of Lust at the Moment of Touch:
   For Hurmat-e-Musaharah to take effect through physical contact, the touch itself must be accompanied by sexual desire/lust (Shahwah) directly aroused by and directed toward the person being touched at the exact moment of contact.

2. Lust Arising from Outside Thoughts/Imaginations:
   If the touch was made without lust toward the mother, and the lust experienced was due to remembering a movie or separate sexual imaginations (rather than being aroused by the mother herself through the touch), Hurmat-e-Musaharah does not occur. Fiqh rules explicitly specify that if touch occurs without desire toward the touched person, any subsequent desire triggered by outside thoughts or memories does not establish Hurmat.

3. Ejaculation Rule:
   Furthermore, if ejaculation occurred during or after the touch or imagination, Hurmat-e-Musaharah is also not established according to the fatwa position in Hanafi Fiqh.

Books, Volume & Page References:

1. Darsul Fiqh (Vol. 2):
   • Pages 145–146: (Chapter: Hurmat-e-Musaharah — Conditions of lust during touch and the effect of lust arising from external thoughts).
2. Fatawa-e-Alamgiri (Vol. 1):
   • Pages 274 / 37–38: (Kitabun Nikah: Chapter 3 – Prohibited Marriages / Hurmat-e-Musaharah).
3. Fatawa Mahmudiyah (Vol. 13):
   • Pages 35 & 53: (Bab Ta'leequt Talaq / Masail of Hurmat-e-Musaharah).

Important Warning & Spiritual Advice:

While Hurmat-e-Musaharah was not established legally, watching pornography, indulging in sexual thoughts regarding Mahrams, and committing forbidden gazes are severe major sins (Kabirah sins / "Zina of the eyes and mind") in Islam. It is strictly obligatory to immediately cut off all access to pornography, avoid being alone in room settings that trigger such thoughts, and make sincere repentance (Tawbah) to Allah.