Turns out Dad has x-ray vision just like Mom. B suddenly announced last night that from now on we were going to read bedtime stories in CC's bed only (we had been taking turns). I didn't think and just agreed.
Dad, however, became suspicious, especially as B kept repeating the rule and becoming more adament. Sure enough, under the bedcovers were Megatron, Optimus Prime, Hotshot and some AllSpark cubes.
Three cheers for superhero Dad!