Two-tier incest with my stepsister... almost broke the bed

Living space is expensive these days, so the stepbrother and stepsister, even though they were already adults, had to live in one room and even sleep in one bed... a bunk bed, of course, to be on the safe side. But sin was still close at hand, and one day, the blonde with big tits decided to masturbate on the bed, and her brother saw it from the top bunk and started jerking off himself. Realizing that they were jerking off to each other, the stepbrother and stepsister decided to fuck each other so hard that they almost broke their bed.