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                                                                                                                                                               纯一把活塞拉到最顶端，让空气充满注射器，把注射头对准小雅的臀部，用力一顶，“噗！”注射头应声插入了小雅的肛门。
                                                                                                                                                                “啊！”小雅的整个身体颤动了一下，纯一不等小雅有进一步反应，顶着活塞的手用力一推，活塞中的空气已完全进入了小雅的身体内，纯一顺手一抽，注射头已经离开了小雅的肛门。
                                                                                                                                                                趴在地上的小雅和刚才有点不同，现在她的双腿颤抖得更厉害了，大腿和小腿已经不再是一条直线，因为膀胱内充满了空气，所以小雅不由自主地想夹紧大腿，结果是小雅的膝盖跪在了地板上，大腿也并在了一起，拚命忍住放出膀胱内空气的衝动。
                                                                                                                                                                纯一用满意的眼光看着小雅的变化，开始用语言刺激小雅︰“怎么样？是不是很有充实感？是想放屁吗？现在可不准放出来哦！”
                                                                                                                                                                听到纯一下流的话，採取狗趴姿势的小雅觉得浑身发热，有点昏眩的感觉。
                                                                                                                                                                正在小雅专心忍耐的时候，纯一已经再次准备好了另一筒空气，乘着小雅不注意，快速地把注射口插入她的肛门，一气呵成地把第二筒空气注入小雅体内。
                                                                                                                                                                “啊！！！”小雅的小腹开始膨胀，令她觉得自己肚子好像是个充满气的气球，大量的空气在膀胱内乱窜，要找一个出气口衝出来。
                                                                                                                                                                小雅现在已经不能分心理会纯一下一步的行动了，她必须一心一意地控制肛门的肌肉，保证膀胱里的空气不会喷出。
                                                                                                                                                                “小雅，做得不错，

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