Ladies and Gents – I’m presenting you the Magic Book.
Moose – was kind to commission me – and also gave me entire freedom to make this – so he told me he’s writing and article about the anal sex on his site. I guess you can foresee the science in his wisdom on his site here:

Speaking of “Freedom” – the point of this commission was to draw a girl who’s leaning forward, spreading her butt cheek (one cheek – so her rear entrance is to be seen) and holds a book /about anal sex/.