Fucking the sister-in-law in the same bed she sleeps with her brother
He has nowhere to live and turns to his best friend, who also carries his blood and the bond that unites them is as strong as the one that two people who have grown up together can have. They both came from the same womb and were procreated by the same man, so it is logical that when one is working, the other takes the opportunity to fuck his sister-in-law in the same bed where she sleeps with her brother. There is not much difference and there is no jealousy either, the pussy that one can enjoy is also available for the other to put in and get rid of while his own slut.