How to connect two jQuery objects? How to add a method to the end of an object?

Question

JavaScript

There is an object

SelectSlice = $('.accordeon').children().first().next();

Nextus = .next();
I'm trying to connect it to another:
$.extend(SelectSlice, Nextus);

How to get the object ? How to add a method to the end ? $('.accordeon').children().first().next().next().next()