Yeah, have to agree with others. It has it's share of suggestive themes and violence, but nothing "radically insulting" a 13-year old couldn't read.

(heck, TV shows a LOT worse these days.)
(well, a name "Jesus" is being used a few times when baffling over something, I don't know how really religious people might react to that. Again, nothing too serious, but you'll never know how different people think of it. )
So yeah.. if you like the games, you'll definitely love the comic too. And even if it weren't as funny as the games to you, it's definitely a precious piece of gem that introduces you to the very origins of S&M.