This mistress has a thing for pony play. She likes to ride them and she rides them anywhere she feels like. But today she did not have her pony as it was sick. She did not have a replacement so she made a lot of noise and threw a lot of tantrums till she used her slave as a human pony and rode him all over the field. He was humiliated and in pain.
Mistress Celine loves to humiliate her slave. But her slave is thankful that she does not torture him like other mistresses do to their slaves. She prefers to just ride her slave like a pony and when she feels she has had enough she lets her slave go. Being a human pony can be tiring but it is nowhere near being fucked by a strap-on like other mistresses do to their slaves.