Under Muslim Personal Law (Shariat), a girl who has attained puberty (presumed at 15) can contract a valid marriage.
Moreover as your wife is 19 years old (having turned 18 prior to mid-2025), she is legally a major. Under civil law, a marriage contracted while minor becomes fully valid once the minor reaches adulthood, provided she does not repudiate/repudiate the marriage upon turning 18. Since she accepts the marriage today, the marriage is legally intact.
Mandatory registration under state Uniform Civil Code (UCC) provisions or Special/Compulsory Registration Acts applies to existing marriages, but authorities register marriages based on current eligibility and valid consent.
You do not need to register a "past minor marriage." Instead, you and your wife can register your marriage directly under the Special Marriage Act or the local Compulsory Registration of Marriage Act at your local Sub-Registrar’s office. You will apply together as two consenting adults (ages 25 and 19), submitting age proofs showing she is currently over 18, photos, and mutual consent declarations.
In both civil law and Islamic law, forced consent (coercion) renders a marriage voidable at the option of the coerced party. However, if the coerced party later ratifies/accepts the marriage after the coercion ends, the defect of consent is cured.
Criminal proceedings under criminal law or child marriage prevention statutes require an aggrieved party, victim, or state authority to initiate a prosecution/complaint. Neither you nor your wife are filing a complaint against your father, and both of you are now consenting adults living happily together. Registering your marriage today as consenting adults does not automatically trigger an investigation into past parental pressure.
Consent does not require explicit verbal permission for every playful interaction. In law, consent can be implied through conduct, context, and mutual ongoing engagement (such as mutual tickling, smiling, and non-resistance).
Your wife is legally your spouse. Even setting that aside, playfully covering someone's mouth during a lighthearted, consensual interaction with mutual smiling is not a crime, battery, or illegal act. There is no criminal offense when both individuals are willing participants.
Do not worry about legal technicalities regarding your playful interaction or past parental pressure. Focus on supporting your wife and moving forward together as legally recognized adults.