After school

That afternoon John goes in to his room as soon as he gets home and starts to change his clothes. All day he had trouble doing his school work memories of his sister in the shower kept popping up.
He had just taken his pants off and put them in the laundry basket when Stephanie came through the door and closed it behind her.
She started talking in a low voice and ask him "Do you know what a blow job is?" John just smiled at her and nodded his head "Me and some of my friends at school were talking about sex." She added "And we talked about blow jobs. We ended up arguing about what exactly a blow job was"
John noticed Stephanie was watching his cock.
Stephanie kept talking "I was wondering if you had ever had a blow job and could you tell me what one is?"
John knew what Stephanie wanted. So he walked over to her got her on her knees and stuck his cock in front of her face.
John watched as Stephanie gently touched his cock again this time having a real close look at it. She held the head up and kissed it. She looked up at John and he told her what to do. She then took the head in her mouth as she started sucking it. Johns cock quickly got harder and harder.
Once fully erect Stephanie then tried to get as much of his cock down her throat as she could. After almost **** twice. John told her to suck the head and use her hand on the shaft.
She had already jerked him off once and she knew what to do there.
After a while she noticed his cock suddenly swell up even more. Just before it squirted some hot salty gooey stuff in her mouth. Stephanie swallowed as much as she could but some of it still escaped her mouth and ran down her chin.
As Stephanie left and went back to her room. John could not help praying no one noticed her leave his room with cum on her face and at same time wondering what she was going to tell her friends tomorrow?