My wife found a kit online that enables you to make a molding of a penis and make it into a vibrator. She's keen for me to buy one for her and I said "leave it to me".
Now the fun part.
First, a bit of background. There is a female friend of mine who has since also become good friends with my wife too. I've always fancied her like mad and we flirt a bit (I work with her sometimes). One time a few years back, she came over one evening when my wife was away somewhere and showed me the tassle twirling she had been learning at burlesque classes. She's never been shy and is one of those girls who will flash her tits with very little encouragement

Sooner or later, she lost one of the tassles and she let me put it back on for her. A couple of bottls of wine later and we were sitting on the couch kissing a bit (she wouldn't allow tongues though) with my hand inside her bra. Never went any further but it was fun.
So, when I saw her today, I mentioned the gift and said I might need some help making the mold and to my surprise she said she'd love to help me with it.
So now I'll need to come up with a plausible story for my wife about how I managed to make the mold without letting on I had some help. I know my friend won't let on.
I know I'll need to remain hard while it sets so not only will I be getting my friend to help me getting the mold on, but I'll have to ask her to "help me" stay hard. I might even be able to enlist her help in getting rid of the stiffy afterwards
Anyway, I'll give you a full report of the molding session.