If he's studying to be a chef- why not have a food fantasy night? Whipped cream is obvious-- but there's so much more you could do with that. What does he like to eat? Champagne does wonderful things in a woman's mouth when she's also got "him" in her mouth lol. Remember that scene in the sex and the city movie with samantha and the sushi? Be creative!! Raid your pantry and find anything that looks fun! Anything you could put on an ice cream sundae, including cherries lol, fruit, or anything else that seems good at the time.
Otherwise- I have before and will again recommend games. Like strip poker, strip mariokart (maybe that's just me lol) gets him excited, or a game like "A Hot Affair" which you HAVE to buy! It's really exciting and intimate and sexy and kinky and everything all at the same time.
Plus, it will give you lots more ideas.
Go to an adult store together, even if all you do is look around. Maybe buy something if it sparks your fancy.
That's all I got