Penny's family

By the time they arrived at Penny's house her family were sitting down to dinner.
They were all there Penny's parents Bob and Jill, her two older brothers Steve and Terry and her younger sister Melony.
Jack and Amber joined the family for dinner.
After dinner every body went in to the livingroom and started watching T.V. Jack was quickly bored and told Penny's mother to suck her husband off.
Jill knelt down in front of her husband undone his fly and pulled his pants down.
She started sucking on his cock and Bob got hard quickly. Jack had not seen many guys with erections but Penny's fathers cock looked very thick to him.
Jack had a quick glance around the room. Everbody else was watching the T.V and not even looking at Penny's parents.
Jack sat up and started leaning forward to have a better look. Watching Jill fuck her face on Bob's cock. Suddenly she pulled her face back and Jack saw the cum shoot out. Some of it landed in her mouth. After the first it became a trickle. Jill had her hands wrapped around Bob's cock. Soon her hands were covered in Bob's cum. Jill started licking up all of the cum. She started with his piss slit and then his shaft.
After she cleaned Bob's knob she licked her hands clean.
After watching Jill suck Bob off and lick up all of his cum. Jack decided he needed a blow job. But who would he get to suck him off. Jill, Amber, Penny or Melony?