FantasyJourney//The spell has a weird side effect

From Create Your Own Story

As you thrust and heave inside her you find that she's suddenly becoming less tight and her features are changing before you know it she's transformed into a female horse before your eyes. You can smell that she's in heat. This drives you even more wild as you start to pound hard and fast. You feel yourself getting close and let out a long whinny as you cum deep inside her. A few months later she gives birth to your foals. You got the horse ending.