I don’t volunteer for that either (I’m a man) although I did teach Sunday School for 2nd and 3rd graders back in the 1980s.
I’ll never forget the time I halted a lesson because I felt something on my ankle. I lifted my pant leg and noticed a flea. I plucked it off my leg and said,
“Children, you’re in for an instant Bible verse lesson. The Bible says the wages of sin is death and this flea has just sinned against me.”
With that, I crushed the little bug between my thumb and a fingernail.
I’ve taught 1st, 4th, 6th-8th grade and a combined HS class (9th-12th). I’ve always marveled that no one questioned my background, faith or knowledge. I’m a mother with one child and maybe they figured that I was safe (which I was!) They were just glad an adult volunteered. I like your flea lesson.