Моя маленькая сводная сестра предлагает мне секс, если я возьму ее играть в футбол с моими друзьями

I have a super important soccer game with my school friends, my stepfather can't take me to the field since he is super busy, he tells me to tell my little stepsister, I tell her, but the very nymphomaniac tells me She offers me to fuck her hard and cum in her ass to take me, I agree since I have to play that important match. That was my motivation and we became champions.