In addition to the countless tight holes, since spongebob is a sponge, if you ejaculated inside him your cum would be absorbed into his body. So if spongebob got gangfucked by Squidward, Mr Crabs and Patrick, his body would become bloated with cum. Imagine it, a disheaveled sponge boy engorged with semen, with drops of fish nut leaking out of his used orifices that cover his delicate body. He sneezes and cum coats all surrounding objects. He would also vomit up the cum. If he cried cum tears would pour from his blue eyes. And then spongebob would eventually die from a cum overdose. Talk about a great episode.