In future, make the thread title a little more descriptive. Anyway, when it comes to writeing content, so long as its not a blacklisted subject (like under age sex), and in situatons that need it you have permision from the origional writer to add content to an already existing character (some writers dont like other people messing with their submisions), then do whatever the hell you want.
TiTS is a very open game, if you have something you want to make, then make it... however you must always accept the fact that the chances of your submision getting in are not good. The qualitiy requirements are very strict.