Susan was sound asleep when all of a sudden she woke up as she herd noses down stairs.
She got up and put on her rob as she slowly made her way to the top of the stairs. When she got there she seen that there was a light on in the living room and she definitely herd a noise that sounded like her brother was feeling up the body of Diana that Susan had given her.
As Susan slowly made her way down stairs with a smirk on her face she thought "well little brother I guess you really like that body" as she herd her brother's scream as she obviously had an orgasm.
When Susan turned and entered the living room it was to see Matt a friend of hers ramming his dick into the body of Diana which her brother had. Not only was he having sex with her but it looked like her brother was even helping him a little.
Susan was shocked at first and did not know what to do until she was snapped out of it by her brother having another orgasm as Matt said "I'M COMING" as he obviously just shot his load into Diana's body.
"WHAT THE HELL IS GOING ON HERE" she yelled only to have Matt jump up to cover himself, letting her brother fall back on the couch as her fingers of one of her hands went to her pussy to continue to play with it as the other was playing with her breast.
Matt looked at the obviously mad Susan as he said I can explain.