I'v been there & done that  a few years ago, back before the new owner & forum for BYC (back when we were still on EZboards & CC was running the show)
 
Does anyone remember that thread?...it was one of the funniest ever!
 
The eggs (Silkies - "Boo & Bee") hatched late & didn't make it very long.
 
A Man also joined in with a body hatch only men can do, he also had a hatch, don't remember if they lived.
 
I'v done this a few times since with Quail, Ducks, a Ringneck Dove & Chickens at about a 35%-40% hatch rate & survival rates could be better.
They always hatched days late.
 
The secret is to try to stay at a stable temp. & keep the eggs from coming in contact with your body oils.
I stick them under my breasts, but I don't cover the whole egg just about 75% of it so the eggs can breath. At night when your body temp. drops I cover them 90%
 
NO quick movements AT ALL, I have killed young embryos that way, sit & stand up slowly.
 
In short it's fun to do & bonding but bators work a hell of a lot better!