Grandma is an expert at handling cocks
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Modern society exerts pressures on young minds, these and the previous ones, are not made for that kind of thing. Evolution prepared us to go out hunting from a very young age and, after being successful, to have sex. Now a protocol is required that changes every year. So this mother, knowing she has to protect her son, decides that he has to lose his virginity with his mom, because no one will love him more than she does. So she is the first to suck his cock, and also the first pussy he can fuck. Something exemplary.