During a family trip, I hadn't been to a hot spring together with my sister in a long time, and I was surprised to find her breasts were much larger than I had imagined. My gaze was irresistibly drawn to her chest. I couldn't help but think about how soft and large her breasts seemed, and just as I was imagining touching them... it hurt so much because they were so firm! I never thought I would get an erection around my sister! I was so flustered that it was obvious and my sister started teasing me, sensing the awkwardness. Yet, her eyes gradually turned into those of a woman looking at a man with lust... leading to an absolute taboo of incest!
