You almost don't have a choice!

You hammer into her faster and faster, slowly her body is adjusting to the punishment and pleasure you are laying into her and she tries to reason with you again "You can't spring, it is nearly the end of the summer, please I don't want a foal, You can use my mouth today and in October you can cum inside as much as you want every day please!" her panic setting in is almost too much for you to bare and you speed up "I'm sorry, I feel it too, please forgive me!" You push in deep and hope your ploy is enough to keep her from killing you as you spray what feels like an endless stream of seed into her warm milking pussy.