WHOA SIS!

Don't know what my parents were thinking but today is my birthday, and I am 364 days younger than my older sister. Tomorrow is her birthday.
Growing up we always saw each other naked.
Today for my birthday she's sucking my dick... right now. First time ever and she won't let me pull it out of her mouth.
FUCK!! I'M GONNA NUT AND SHE'S GONNA SWALLOW!!! OH SHIT!!!