Safety's always first man.

A pencil case

Coke bottle

The Universe.

Two hundred and forty dollars worth of pudding.

A b-baseball bat?! That takes some stamina!
I wish I was that flexible.
As for what you should try next.. Maybe some kind of smooth, oddly shaped statue? You can find all sorts of things if you check in a charity shop or somewhere similar!

I need something long and flexible to get in there real deep, but don't have the ability to get a dildo.

That actually sounds like quite the filling.

everythings a dildo if youre brave enough :P XDDD

That's already been said nekoun

Modify one of those pool noodles lmao.

Modify an extention cord, make a literal buttplug.

That's a thought. lol

I never put something in my ass, but one time I found my cousin with a bottle of lube and a tennis racket in her butthole, obviously by the handle XD

*Badum ts*