It was supposed to be a punishment.

Jason had no idea his sister knew what he got up to when nobody was at home.

He also did not know that she has set a trap for him.

He snuck into her room like he had done many times before and put on her little cheerleading outfit before masturbating to his own reflection in the mirror.

Which sprung her trap and turned him into a female version of himself with only one thing on her mind (helping the football players relax after a game).

Only his sister and himself knew the truth who he really was but both of them agreed his life was better this way around as he did not have to hide who he really was a horny teenage girl inside who loves the attention of men