My sister stole my manEpisode 3

She thought she was the lucky girl, with the perfect boyfriend. But one day, she discovered that the relationship between her sister and her boyfriend had turned dangerously complicated. Her boyfriend was deeply drawn to her sister, and with every exchanged glance, her inner world began to crumble, mixing jealousy and desire. She knows this relationship is forbidden, but with every intimate touch, every closeness, she finds herself sinking deeper. Can she resist her inner longing, or will she lose herself in the pull between desire and family?