Fuck my future sister-in-law while my lover is away

I and Sakura have been in love for a while and are planning to get married. She has a younger sister named Mahina. Mahina is truly beautiful, cute, and her G-cup breasts are so attractive that no man can take their eyes off her. Since she was young, Mahina has wanted to have what her older sister has, which makes their mother struggle when buying things for both of them. But it seems that she wants to own more of her sister's belongings, not just clothes. Today, Sakura is traveling with friends, she will be away for three days.

That night, Mahina came to stay at my place temporarily because she was late coming back from school. Since she didn't have any clothes, she wore Sakura's clothes. The outfit seemed quite loose, revealing her breasts completely in front of me!!! She also noticed that I was looking. She then approached me, placed my hand on her full breasts, gave me a sweet kiss, and started seducing me! Although I knew this was wrong, I couldn't resist her and ended up passionately making love with Mahina for three days while my girlfriend was away...