You pass me the subject, and I’ll give you cock
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It seems that his mother chose the right woman to look after him while she is out making a living. Something that can’t always be said since experiments often end badly. However, the fact that it’s her sister and they share many similarities seems to help a lot. The problem is that the nephew seems to have a fixation with fucking his aunt’s ass. She, knowing that boys will be boys, lets him put his dick in as long as it doesn’t interrupt her daily chores, and he can even cum inside because she won’t get pregnant.