The shooting is clearly amateur, the lady doesn't want to advertise herself and is wearing huge glasses all the time. Is she skinny? I would rather say she is athletic with a very nice figure. It's a pity they fuck in such unsanitary conditions. If they would have taken a hotel room, they could have made a more interesting video.
Every girl dreams of getting a portion of sperm on her face, in her pussy or anal from a handsome brother. A walk in the fresh air did the young men good. Her sister was intemperate and she easily managed to seduce her brother to have passionate sex with him. Her loud moans only encouraged the handsome man and this is not the last hard sex of the brother and sister in love.
The lady is old, and her labia are like those of a young girl. Probably would have been nice to try her in the front. But the tits and abdominal folds are clearly unimpressive.