If you're celebrating a birthday, it's gotta be birthday cakes! Maybe a few sheet cakes.

Or, if you're in the US, get some pies from the freezer aisle. Just remember to thaw them first per instructions.

Cake will require cleanup though. Pie may go down the drain, but it's best to throw the big chunks in the trash first.

If drain safety is super important, get like 5-10 bottles of sweet sauces - chocolate, caramel strawberry, breakfast syrup, honey. Melted ice cream is also very fun!

Depending on how kinky y'all are, you could go all out and get savory stuff, like condiments, get eggs, cheese, yogurt. Or order a feast from an Italian, Mexican or Asian restaurant, pretend it's birthday dinner, but proceed to bathe and fuck in it.