I'd get outside help asap on how to handle the situation, push my husband to get on board because his son may be in very real danger himself.
Also if it were my daughters I'd not leave them unattended for a minute, doors open policy or even doors off hinges for bedrooms. But I'd try to look at your 6 year old step son as s victim and a child, not a predator. As hard as that would be. How frightening and awful
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