Sister asks him to cum inside
Body language sometimes says much more than verbal language and I mean by this that when a girl wants to fuck or even want you to cum inside her, just one look will be enough for you to know exactly what she wants at all times. Starting to play sports just when she knew that her brother would arrive is something that this young girl does regularly, she is aware that with those shorts she shows off a nice ass and the big slit of her pussy, so it will be impossible for her brother not to end up putting her on all fours and fucking her hard.