Here’s the list of things I’ve used before in my ass and they did the trick:
Screw driver handles
Cylindrical tubes of any kind...though if they are hard plastic, use tons of lube!
Curling irons, turned off obviously, and then pushing the button to open it up.
Pens and pencils
Beer, champagne, wine, liquor bottles (with a condom on the neck to avoid it getting stuck!)
Bananas (my go to when I travel and don’t pack a toy...hotels always have bananas and condoms! Lol)
Smoked sausage (felt very realistic!)
The key is: make sure you are lubed up and the object is clean. When in doubt, put a condom on it.