What should I put in my enema

I have done enemas before for kink purposes. I would fill myself up with 2 liters of water and plug my anus so it won't leak out but the thing is that the urgency is not enough for me. The urge when you try to poop out the contents on a medically reasoned enema only works when there's poop In your bowels.

What I'm trying to pull off Is that when I take a large enema is that after a few minutes it gives a strong urge to defecate even when there's nothing there. Something that feels good when taking it in and pooping it out