I fall in love with my Adopted sister

I looked into Vivian's eye while we were about to make love for the first time in our secret affair; her parent died in a car accident while they were on their way for a business trip when she was just 10 years old. She was then adopted by my parents when I was just 13 years old. Vivian and I have been good friends; we have lived like siblings, though she was aware of the incident, but my parents had to make her feel at home. However, our love journey started when she turned 16 and I was 19 years old. We would play around as lovers each time our parents weren't around. As well as sleep on the same bed. While at school, I always defended her; I protected Vivian and was jealous as well. Seeing her associate with other men friends always pissed me off, that we do have misunderstandings as well. But she was such an intelligent girl that she observed the weather. As soon as she saw my mood, she would quickly dismiss herself from their midst. Vivian was bullied by a student simply because she refused to be his girlfriend. I didn't mind; I was ready to go to jail for her sake. I had to bully the person as well. I made sure he was rushed to the hospital. When this got to my parents ears, they were all mad at me for not reporting it first to the school authority. "She is the only one I have; she is more than a sister to me." I replied to my parents, showing how dearly I love Vivian. "You shouldn't have done that, son; it is an act of violence, and you're taking the law into your own hands." Dad said to me. "I am ready to go to jail for her sake. I don't care what comes after the violence; my parents were shocked on this, especially my mother, Sarah. She stared at me and looked at Dad, with her eyebrows straight on him. None would say anything about this. But the feeling was so strong that I and Vivian can't resist it. The case got settled; I and Vivian continue where we stop; meanwhile, my parents were so careful with my words that they started monitoring us. Especially Dad, who has discussed getting me related to Sofia, a daughter to his business partner, and Mom was also in support of that. But haven't disclosed that to me. Vivian is 20, and I am 23 years old; our birthdays were celebrated annually. Despite that, Vivian could sometimes spend the night in my room, or I could as well. But this time we did the unexpected, which was just three days to welcome Sofia into the state and to have us both speak for the first time. " Have anyone tell you how beautiful you are.?" I asked Vivian, as she got blushing. "You are such a beautiful girl, and I can't afford losing you." I said to her, seeing the feeling in her. Vivian's smile makes her more beautiful, and her response sounds like an angel. Gradually, we started drawing closer, with our lips almost at each other's mouths. "I can't do this, Richard." Vivian said to me. "Why.?" I asked her, with a trace of curiosity. "You need to understand that we are siblings, even though we love each other. Don't you think I am meant to be with another, not you?" She sounded all this to know my response. "Look here, Vivian, I have loved you for a very long time. We both know about this. I fought for you; I protect you more than like a sister. I have done everything I have to do for a lover to you. Why won't you give me the opportunity and believe that I love you?" I replied to her. "I can't hide the feelings I have for you, Richard." She said to me, drawing me closer with her hands on my cheeks. "You are the first man I have ever loved. I clocked 20 right on your lap there in the sitting room when you promised to be awake with me until the clock got to the pointed hour. You have shown me love; not just that, I feel I am in love with you as well." She answered me as we both had a romantic discussion. As I was about to say more words; Vivian kissed me on my lips. I couldn't resist it, with her soft and romantic kiss, her index finger on my chest was like a pointed love moving around my chest. I felt a butterfly in my belly, like one who was already in heaven singing with the angel. "You can have me to yourself." She said to me. Gradually drawing more closer to the bed. Vivia lay flat on the bed. I thought she was just a novice, not until she got me deeply horny. I had to start licking her laps, down to her legs. She felt more romantic as my body reacted. Then I said into her eye. You are my lover friend." Vivian quickly cuddled with me; with that, I had to lose my bet, same as I made her naked. Without much waste of time, I penetrated her. She moaned, and being the first time, Vivina could feel the pain. That makes the day we both broke our virginity. And vow to love ourselves irrespective of anything. Not even Sofia would stop us. "This is like an oath. But we have to keep it to ourselves. Promise me that you will love me with your heart, irrespective of what comes tomorrow. The challenge as well." Vivian said to me, as the bedsheets were stained with her blood. It was an oath we were taking, but having our wedding vow exchange right on the bed, without anyone. "I will love you with all my heart, Vivian. I promised to do that; not even Sofia would stop me. You are my woman." I said to her and kissed Vivian on her forehead as we fell asleep.