He is 15.They have been incredibly close for a few years. Never romantically interested in each other. Both sensible, level headed kids.
Today is the first day of their school holiday, dd has spent the day at his house and has just come home asking if she can pack an overnight bag so she can stay there tonight. I didn't think twice and said it was fine (just as I would have if she had asked to stay at a female friends house).
OH is not happy and thinks I should have said no (I didn't think to check with him first)....