The whole ad is Japanese sexual fantasies.
Innocent School Girl thing
Looking at the bird (a whole sub culture of people that use camera phones to sneak a look)
Domination
Toothless BJ
(CIM tastes like fish)
Asian Cowgirl
Reverse Asian Cowgirl
The milk is used to express completion of each act.
Anal sex = Feline disrespect from behind. A form of Reverse Asian Cowgirl, you see it in cartoons also done seated in public transportation. They have this big sex in public places thing.