Aw, that's very flattering. :3 Practice makes perfect...I still make mistakes.
But anyway, about the rating...I suppose if it gets to real lemon, you'd have to PM me a bit to see if I can even allow it. PG13 is pretty much a light version of R, however, there is absolutely no sex or nakedness going on...but other wise, all fair game. Same with the violence. R fics are basically limes and NC17 is lemon.
You also do have the choice of rating the fic and then rating a particular chapter higher. The point of ratings is just to warn your readers and give them a chance to decide to opt out of reading if they can't handle it.