A very helpful tipster, Tony, has directed our perverted eyes at an RPG called Ar tonelico that takes child sex (or child-like sex) to a whole other level. Watch for yourself: Go here, then click on "Download" and then "System view." Here's the good stuff from the trailer:
Girl: ... insert it into my back.
Boy: I got it, here goes.
Girl: Ouch! It's OK, push it all the way.
Boy: I'm sorry, it must have been painful.
Girl: It's OK. As long as it's you, I can take the pain.
Here's another gem, but it's in Japanese. Either way, you get the idea.