After getting a tool to fulfill his delusions, my brother accidentally switched places with his sister while testing it! His curiosity about the female body for the first time won't let him stop checking it out. Smell, weakness of strength, urgency from needing to pee to actually pissing, especially...the sensitivity inside her vagina is tens of times more than a man's! A pussy that stays wet from being touched → first orgasm with the opposite sex. What she's curious about is a man's dick. "What would happen if it went in..." And finally, incestuous penetration. The story of a sister (male body) and brother (female body) having secret sex and cumming inside
