h_1844krg00023 ``Even though we're parents and children, we're not related by blood, so it's good!'' says a mother-in-law and her son who have sex on a one-night, two-day hot spring trip.

``Even though we're parents and children, we're not related by blood, so it's good!'' says a mother-in-law and her son who have sex on a one-night, two-day hot spring trip.