歳の離れた夫と再婚した義母の彩。成人しても自宅で引きこもる息子の事を案じて、義理とは言え母親として、優しく世話をしていた。ある日息子を励ましてあげようと子供部屋へと入った義母は、いつの間にか洗濯物から無くなってしまい困っていた自身のパンティを発見する。慌てて平謝りする息子を見て困ってしまった義母は、優しく包み込むように彼を励まし慰める。しかし興奮した息子に押し倒されて挿入されそうになってしまい…！

Aya, my stepmother, had remarried a man much younger than herself. Worried about her stepson, who remained a shut-in even as an adult, she cared for him tenderly—not just as a stepmother, but as a mother. One day, when she went into his room to cheer him up, she discovered her own panties—the very pair she’d been searching for after they’d mysteriously vanished from the laundry. Seeing her son frantically apologizing, she felt torn, but she gently embraced him, offering encouragement and comfort. However, her excited stepson suddenly pushed her down and tried to force himself on her…!