Bitten

"I think I've been bitten on my bum," said my wife, bending over and pulling up her skirt. "Can you see it?"
"Oh my God!" I said. "It's absolutely massive!"
"Is it?" she replied.
"Yes," I said,
"Oh my God!" I said. "It's absolutely massive!"
"Is it?" she replied.
"Yes," I said,
Spoiler: