Sister helps to lower the cock to brother because of viagra

My brother took Viagra and I helped him down. Well my brother wanted to test the effects of the pill viagra, but he had a bad time because he had a hard cock all day, because his sister, the son, would help him and began to masturbate his brother and he was very sorry that his sister I touched his cock. But he did it very well that he got very excited and the brothers ended up having sex.