PPPE-120 Asking your girlfriend's sister to teach you how to make love ends up being more addictive than fucking your girlfriend

This is the first time I have a girlfriend, who studies in the next class and is also someone I have loved unrequitedly for a long time. I am going through a happy but also extremely sad time. She wants to have sex with me!!! I know she had a boyfriend before, although I don't know if she's ever had sex, but I don't have confidence in myself. If I can't satisfy her, then She will criticize me and leave me. If I miss this opportunity, I will not be able to escape the life of a virgin for the rest of my life. While not knowing what to do, my sister offered to help me by... letting me practice. fuck her!!! And then I was able to escape from being a virgin, her huge soft breasts rubbed against me, making my cock hard immediately, she sat on my cock, taking it deep into me. inside her body made me unable to bear it and quickly shot semen inside her body. This was supposed to be just practice for me but I couldn't stop anymore, I addicted to the feeling of having sex with you, I like you and want you to become my own woman...