She lingered in the doorway, determined to watch his fuck-juice spray out, enjoying the sight every bit as much as her mother from whom she had inherited her voyeuristic instincts, her peeper's passion.

Belinda wanted to look at least…

Holy shit, Jenny thought.

Tommy was unaware that his kid sister was looking in his door but from her vantage point behind the one-way mirror, their mother had seen the girl's excited and radiant face peering around the door frame.

Knowing that she was sharing the pleasure of watching Tommy work with his sibling made Jenny hornier than ever. She began to rub her cunt furiously yet tried to hold back, at the same time, wanting to delay her creaming until the instant when her son sprayed the glass with his spunk so that they would share a simultaneous cumming.

Tommy's eyes were lowered and hooded as he stared at the reflection of his cock and balls in the mirror. But then his gaze flickered up and he saw his sister's face appeared behind him in the glass.

He blushed and his head snapped around. "Jeez, Sis what in hell are you doing?" he gasped.

Finding herself discovered, Belinda blushed, too.

She started to back away. But then she paused. Why should she be ashamed when it was her brother who was playing with his prick? Instead of retreating, the naughty girl stepped into the room and closed the door behind her…

CHAPTER FOUR

All squirming inside her dressing gown, Belinda walked boldly up to her naked brother.

Tommy looked dismayed and distraught. But Belinda was smiling provocatively. "Exercising your muscle, Tommy?" she asked, feigning a sort of demure innocence. But there was nothing innocent about the look in her smoldering eyes.