Any sister should help her brother get unloaded. What does it cost her to give a blow job or let her in the pussy? It's not like she's gonna get wiped in a couple of times. But she'll get his respect and an extra workout in return. Plus she gets to taste his condensed milk for free. )))
The chick is used to being treated this way. The impotent husband lost her at cards. That's why they've been pulling her like a bitch all day long. And the harder the stake, the harder they drive it inside. Only the pussy is already so used to the new masters, to the abundance of milk - that she does not want to go back.