Getting closer

function nextInDOM(_selector, _subject) {
    var next = getNext(_subject);
    while(next.length != 0) {
        var found = searchFor(_selector, next);
        if(found != null) return found;
        next = getNext(next);
    }
    return null;
}
function getNext(_subject) {
    if(_subject.next().length > 0) return _subject.next();
    return getNext(_subject.parent());
}
function searchFor(_selector, _subject) {
    if(_subject.is(_selector)) return _subject;
    else {
        var found = null;
        _subject.children().each(function() {
            found = searchFor(_selector, jQuery(this));
            if(found != null) return false;
        });
        return found;
    }
    return null; // will/should never get here
}

jQuery('.toggle-trigger').on('click', function(e) {
    e.preventDefault();
    var target = jQuery('.toggle-text');
    console.log(nextInDOM(target, jQuery('.toggle-trigger')));
});