The unattractive man gets excited by her defenseless appearance! Even though he knows it's wrong, he can't help it and masturbates to his sister's lust. But she notices and it becomes awkward! "Men have to let it out when they're pent up, right? I'll help you get it out," she says, giving him a handjob and a blowjob, but he can't get it off so she says, "I can't put it in, but I'll just rub it."