七海不忍心看到哥哥雙手受傷無法自慰，便幫他撫摸陰莖。從此，偷偷摸摸的自慰輔導成了日常。不只是用手撫摸，還會口交、自慰……終於，兩人快要插入的時候，就約定了「插入3cm以內不算性交」的規則，開始了不完全龜頭性交。 3cm插入就安全了嗎？明知是錯的，卻依然深插的兄妹倆，看著真是色氣十足！插入陰道深處的那種罪惡感和快感，簡直無與倫比！
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