I don't know about rules, but just be careful. it is VERY easy to be vulnerable in this type of scenerio and it is darn well exciting to let things evolve, so just make sure your doing things for the right reasons.
I'm glad to hear you already have a sitter. I know it sucks that he's not being exactly as responsible as he should, but it's probably good for him to have time to go out too... unless it's something he totally takes advantage of, but it didn't sound like he had in the past that I could remember.
Me 33 H 34 S9 S3 M 6 yrs (2gether 11 yrs) EA/PA 1/2006 DB 5/2006 H wants D 6/2006 H wants ME 8/2006 H "said" PA/EA over 8/2006 H erased OW off phone! 2/2007
"It is far better 2 choose humility & change oneself, than 2 wait in vain trying 2 chang someone else."