A young brother who was hospitalized can no longer endure the abstinence lifestyle, and when he asks his sister, a nurse, for help, she reluctantly agrees. At first, it's just a handjob, but it escalates to breast rubbing, nipple play, and a blowjob, and eventually she starts to rub her breasts, tease his nipples, and even gives him a blowjob, saying, "Let me put in just 3cm," and then she has sex with him. However, there's no way she can hold back there, and she ends up inserting it all the way. Even though she's angry, her sister can't help but feel aroused by her brother's dick...