A combination of mother x son and daughter x father. Four family members breathe together and challenge ejaculation and acme at the same timing! Allowed error is up to 5 seconds! Fucking pinch and Blow Cum also succeeded at the same time and got a prize! Continuous vaginal cum shot while competing for the same timing! If mother and daughter become pregnant at the same time, the sense of immorality will be doubled! Double the excitement! Is simultaneous ejaculation conceived without error and vaginal cum shot succeed? ??