第二章(4/6)

                                                           “呵呵，等不及了吗？看来我们的小雅是爱上浣肠了，一天不干，屁股就发抖。”
                                                                                                                                                                原来连续多天的浣肠已经令小雅的身体产生了条件反射，特别是小雅为了坚持超过约定的时限，平时一有空就努力收缩肛门的括约肌，令到括约肌每时每刻都处于紧张状态，结果在不知不觉中形成了习惯。现在每当小雅一紧张就开始不自觉地收缩肛门，造成排便的错觉。
                                                                                                                                                                纯一还不太明白发生了什么问题，不过见到小雅不断发抖着的屁股，突发奇想，纯一走到小雅的身后，蹲下来仔细观察她的臀部。
                                                                                                                                                                这种摆动太熟悉了，每次浣肠到了最后关头，当小雅差不多洩出来时，她的屁股就会以这样的方式抖动。纯一想了想，把右手中指含在口中，沾上唾液，突然往小雅的肛门狠狠一插。
                                                                                                                                                                “嗯！～～”
                                                                                                                                                                小雅只觉得肛门有东西侵入，马上想到的就是用力收缩括约肌。本来小雅那里的肌肉已经收缩得很厉害了，现在再一用力，纯一感到中指好像被几道铁圈紧紧咬住，而且力量不断加大，肛门肌肉表现出想夹断入侵异物的衝动。纯一发现小雅那里的肌肉出奇的发达，一般人收缩力最强的地方是肛门附近，但小雅的那里不同，纯一感到中指的每一部份都像被钳子夹住一样，甚至想拔出来也要费一番功夫。
                                                                                                                                                                “喂！不准用力！”纯一尝试着把中指拔出，但只是向外移动了一点，绝大部份还是在小雅的体内。纯一看着拔不出来，只好用左手按住小雅的屁股，右手猛地用力一抽。
                                                                                                                                                                “波！”
                                                                                                                                                                纯一的中指应声而出，好在插入之前有用唾液润滑，否则一定更难拔出。
                              

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