I want to load up my underwear with some candy, then go about my day and let the candy melt and ooze. Other than cadbury cream egg, do you have any other easily sourced ideas? thx

Cooking chocolate. It's deliberately made to be easy to melt. We did this with Susie once, first she placed a fair bit of chocolate in her underwear, was interviewed like that, then put the rest of her outfit on and got fully messy, but already really squidgy and slippery underneath.