The first step towards wife taking friends cock

So it looks like im taking the first step towards convincing the wife to try something new, ive spoken with a friend about my fantasy to see the wife take a new cock and he has agreed to cast a silicone copy of his cock (clone a willy) so that I can use it on her, as she gets more used to his size, she might open the door to trying the real thing.

He's 6ft 4 with a BBC, wife is 5ft 3, white, blonde hair and average build for a 32yo who's had 2 kids.

Hopefully this is the start of her opening up, figuratively and physically.