All great work!
Can I suggest not using standard horses, though? Partners with a standard horse only get stretched and wiggle on the end of the horse's penis like a shot glass on the end of a pool cue and the horse is simply a masturbatory tool. They could have easily used a one-liter soda bottle (US/CA) or two-liter soda bottle (everywhere else) and had less mess to clean up afterwards.
Horse lovers go for the pony breeds to have active sex. They don't have the girth of a standard horse, but they're still girthy and longer than any man and actively fuck their partners. A safety person is still needed, though. No women can take the rapid 12-18 inch vaginal penetrations from them and walk away. Anal is another matter. If you like deep anal, then a pony breed can and will fill most assuredly that gap in your soul.