The birthday magical girl, having no time to react, and is just basically reamed inside without any warning. She can’t really struggle against it either, the other had pushed in with so much force, and locked themselves deep within the walls of her pussy. It’ll be a birthday to remember.
All that could be let out, were moans. One after another,. Her pitch increasing, and going from a surprised moan, to those sounding more lewd with each and every thrust deep inside of her. By time they did end up cuming inside, all she could do was scream in pleasure.
Whatever plans she had for the day, they’re gone. She’s going to be a birthday sleeve for the day, always in her birthday suit for the other to enjoy ‘gifting’ her a lovely birthday ‘present.’