Public piss enema diaper adventure

I was challenged to go have a fun walk in public. But there is a twist, I need to go out while having a litre of pee in me and I am wearing a diaper, I need to completely release the enema into my diaper before I am allowed to go back home. It does not take long for me to start leaking into my diaper and when I start to turn back I lose all control and absolutely soak myself. This challenge was issued for my community chastity sentence and if I fail the challenge