His eyes opened , locking with mine , our face still only an inch apart after breaking our kiss . His lips curled into a smile before pressing them to mine again , this time with more passion and force . I wrapped my arms around his neck , pulling myself into his lap . I let my tongue brush briefly across his lips , before our mouths both opened and our tongues met , causing a moan to erupt from my throat , as I pressed my chest against Spencer 's .

Question: Why did the writer moan ?
Answer: Because their faces were an inch apart .Because his eyes were open .Because they broke their kiss .It was involuntary and she did it without thinking .