How about a Chocolate Fondue?
Preperation is essential for success. The 'fondue machine' should spend at least a day beforehand eating nothing but peanuts and corn. This is to ensure a good texture.
Now there are several methods, and each has its merits. The first is just the standard fondue. Wait until your partner is really close to sh1tting themselves and then insert as many Cadbury's Chocolate Fingers into the rectum.
The options now are many. You could remove them and share them out, have your parnter sh1t them into your mouth or remove them with your teeth. Some like to double dip, with both partners inserting, then swapping and inserting again.
When done correctly this can be a very enjoyable activity.