Her sister got hysterical over her boyfriend who drew a slutty picture of her - how skinny and flat she was. Her brother calmed her down and measured her waist and hip size, assuring her that she was awesome! Sure, her gratitude was inadequate - sucking her brother's cock, but didn't the girl deserve sympathy? When she wanted to remove her head already, he wouldn't let her - if she wanted to be a grown-up, then swallow it. And it seemed his sperm was to her liking. Now she could always count on him.
It's not clear why the second lady is so indifferent to a fuck in front of her? And the little black lady - they took it out on her ass and she continues to lie there quietly and doesn't run to the bathroom to wash up? Maybe she means that she fantasizes about sex, but nothing really happened.