Is it normal to want to be caught masturbating by my sister?

try having the door open in your room while you masturbate then call her in to the room

It might be better for her watch you dry off when you get out of the shower. Body acceptance is good. Your idea can often cause problems later on.

depends on the age gap between you two.

Not normal in the least. You're a piece of human garbage for wanting her to see you like that!

VERY natural!

'Set her up' to catch you. Leave your door part open. Make more noise than usual.
Wank when you know she's more likely to pass your door.

Once she hears you, she's bound to sneak a look, get aroused……maybe play with her pussy.
& from there…..well, it could go further.

And why would u want that?