godless Steaminess Rating

Exactly how steamy is this story?

PG-13

In general this book is pretty tame. Jason's dad finds Jason's drawing of Bustella, the Sirian Goddess of Techno War, who is wearing nothing but a sword scabbard; Magda strips down to her bra and panties to go for a swim, and later Jason draws a picture of this; plus there's a naughty word or two. But that's pretty much it.