Oh the lies I tell

I'm quite random when it comes to telling little white lies to the boys. Son 2 has started asking "mummy how did Arlo get into your tummy". Now this always panics me when the ask about the birds and the bees. So I said "well Daddy put him there", he asks "how did he do that". Now my brain is turning over really fast, so I replied "he bumped his tummy with mine". His reply "did he do it lots of times", this time I could be honest "no only the once". Fortunately, I get pregnant quite easily!