The sister-in-law of a sex-loving girl calls me "Virgin Boy" and makes fun of me, but contrary to her appearance, she's surprisingly kind and treats me equally, even though I'm a bit of a loner. One day, by a series of coincidences, she even gives me a handjob! After that, I become her sex slave, and eventually, she even makes me have sex with her... As she trains me to be her sex friend, over and over again, I start to want to have sex without a condom, which I had always used before...
