I tried wiped cream and it worked pretty well for us, I'd recommend you to put some plastic on your bed if you are going to do something messy =) also get some WetOnes napkins.

I think as long as you don't have allergy to chocolate, then you should be fine.

Experimenting with food products if fine as long as none gets inside your vagina or in the mans japside.....If it does you should wash it straight away.....but yeah it's ok have fun!
Jenny