Visit Fiance in China

Hi,

I went back to Belgium after being some time in PRC on a L type. My fiance is Chinese and currently working in PRC so she can't just stop the job. I am obviously going back in 1 or 2 weeks to Shanghai to be with her.

Is there no "special" type of entry permit for these matters? Because S type is for relatives and being a fiance of a chinese girl doesn't count I guess?
What can I do in order to stay longer in PRC without exiting after 30days.. if she writes an invitation letter,copy of passport and home address or something like this, I can receive an entry permit for longer period, I live with her in her apartment etc..

What is the best solution to stay for longer periods? ( I don't need to work ). Because I really need to go back to PRC.

Belgian citizen. Last time I got all with double entry visa of 30 days in Belgium. I could use some advise.

Kind regards