His wife

"Obviously it has to be Claire" he grinned.

With a bright flash they both dissappeared, leaving John and Megan alone

"This game is so weird" Megan sighed

"Yeah, how long do you think they'll be gone" John asked

"No idea, you and dad were only gone for a few mins but for a vaction they could be gone days or even weeks"

A few minutes passed as the pair sat in silence, contemplating what to do while they waited.

"Fuck it" Megan said suddenly "I'm going for a shower, give me a shout when they get back" with that she made her way upstairs, leaving John alone. John thought about the wording of his previous reward, did he really have the power to alter people with his cum? It ws a shame he was stuck around family and would have no way to test it... as he thought about it a wicked idea came to mind. He was alone, in the kitchen, they'd all left their drinks unattended. Maybe he could jerk off into one of the glasses, they might taste it though. There was the jug too, the larger volume of liquid might dilute the flavour a bit but he wouldn't be able to control who changed.

He could also call his girlfriend and invite her over, see if he could test it on her. There was always Megan too, sure she was his sister but he always thought she was hot, maybe she feels the same about him?