[Reducing Mosaic]HUNTC-465 A secret diary of my oral sex with my sister! I make my sister perform fellatio and share her thoughts in a diary. Since we were young, she was taught that this is normal between siblings and still believes it to this day. My sister's oral techn

I secretly let my younger sister have sex with my sister and tell her my impressions in a diary, hidden from my parents.She is an obedient younger sister who was taught oral sex as a normal thing for siblings to do since childhood, and still believes it.My sister's oral skills are getting better every day!Recently, my younger sister has become even more erotic and has escalated to the point where she is having oral sex in the blind spot of her parents!It's seriously dangerous!However, the excitement level reaches its peak due to the thrill of not having to be found out by the parents who are nearby!In the end, we crossed the line, and we couldn't stop, and we ended up in a swamp of incest...To my younger sister, this is a normal thing that all siblings do, so she doesn't question it at all.But honestly, knowing the truth, I feel a little guilty.