Sibling TS Story: After a busty older sister and a sexually voracious younger brother swap, they inevitably engage in incestuous acts and ejaculation! Riho Shishido DVMM-350

The younger brother, having obtained a tool to fulfill his fantasies, accidentally swaps bodies with his older sister during a trial! His curiosity about the female body, his first time with her, leads to an unstoppable physical examination. The smell, the weakness in strength, the speed from the urge to urinate to the actual act, especially… the sensitivity inside the vagina is dozens of times greater than a man's!? He masturbates with his constantly moistened vagina, experiencing his first heterosexual orgasm. He's focused on the male penis. "What will happen if it's inserted…?" And then, finally, intimacy begins. The story of an older sister (male body) and a younger brother (female body) who secretly have sex without their parents' knowledge.