Girl loses bets and her punishments are sexual.

Their friendship was a twisted thing they couldn't deny it but neither could they deny that it was the strongest and longest lasting relationship they both had, so they both did everything they could to maintain it, every evening they found a way to be together doing anything to pass the time. However during the last week they had entered a new game that they couldn't stop playing. The idea was simple they would make silly bets on meaningless events and in which chance always intervened, so that whoever lost would receive an unparalleled punishment, Lately those punishments had taken a turn too sexual from which neither of them wanted to return.