You lose

As the race ends, Rita leads you away furious. Once you are back at the ship, you are locked back in your stall. And you know exactly what to expect: nothing. The worst thing a pony could get after a race.

"Tomorrow I will have a surprise for you," she says with a smile. The dildo inserted back and the blinders relocked.

Once Rita leaves, you start to struggle against your bonds, twisting and turning your arms in the horizontal armbinder, your body tense against the chains that hold it in place. But eventually you realize it is useless, and you start to focus your mind on what lies ahead.