My fantasy

I would love my girlfriend and I to both take a big soapy enema at the same time. Then I sit on the toilet with my legs spread wide. She comes and sits on my thighs, facing me. I start to expel, in short spurts. She does too, between my thighs. We wildly kiss and rub each other's pussy to wild orgasms.

That's hot.

Even with an elongated bowl, you may need to raise the seat and sit directly on the bowl rim so that there is ample room for her expulsions to go into the bowl too. It would be a real mood killer if hers splashed on the floor.