try putting some honey on it it should sweeten the deal and if your going to have sex afterwards make him wash is penis off because you don't want honey up in your vagina because it may cause an yeast infection
instead of sending the pics to his work email try to send it to his cell phone that way only he can see it and he won't get in trouble. otherwise it sounds like a beautifull plan and I think he will love it your time and effort. good luck