It is my fault...

As soon as the girl turned towards him after wiping her hands, Jack turned away his gaze towards his wound as if checking out his arm movement. 

Eva walked back towards him and held the green bottle yet again. "I know you have hurt your back. You need to apply this, before it turns worse."

The boy looked at her face hesitantly and then lifted up his shirt a bit. As soon as he jerked his arm he winced in pain and instantly released the shirt. "Never mind. The pain shall go away by tomorrow." 

The girl rolled her eyes again as the boy looked at her helplessly. "It is no big deal. Let me help you remove it. Wear something comfortable after I apply this medicine on your back." The girl spoke a little meekly, wondering if she was crossing the line. But, she was damn sure that the boy must have hurt his back really bad. 

"Alright." The man took a deep breath streching out his hands. He lifted his chin a bit signalling the girl to open his shirt buttons.