The partner is fed up with the usual caresses and he wants something special. And the obliging bitch has found a new trick - she jerked the man's anus with her tongue. The brunette does it so beautifully that I myself from a thrill rushed! And the guy probably responded appropriately - pimped this slut's ass. Such a girl is very valuable - you can trust her most intimate things.
Girls are girls, they like to be poked by dicks, and her brother's dick, even if it's her brother-in-law, is just a twig on which she can wiggle in a good way.