His head was too heave because of gravity .He was tired and passed out on her shoulder .He wanted to show his affection for her .He was using her shoulder to scratch and bad itch .
What may be the reason he rested his head on her shoulder ?
" Pete still smiling did n't say anything and sat next to me and rested his head on my shoulder . Afterwards he gently kissed my cheek as he said"I love you too Trick . "