My sister, who had moved out after getting married, returned to our family home following a fight with her husband. I had a girl I liked and wanted to kiss her, but I ended up getting rejected. When I confessed to my sister, saying, "Sis, let me kiss you," she unexpectedly allowed it. She even started stroking my cock with her hand. Overwhelmed by the warmth, my heart trembled as I gave her my virginity through repeated passionate kisses. The pure emotions I shared with my sister still remain in my heart today.