jQuery: Wrap sibling divs of the same class with flexible selector

I'm looking to target all siblings of the same class name together into a container.

In this HTML,

<div class="pink"></div>
<div class="pink"></div>
<div class="pink"></div>

<div class="red"></div>
<div class="red"></div>

<div class="pink"></div>

I want all .pink divs next to each other to be wrapped in a .pinkwrap container, even if .pink doesn't have any siblings, like the last line. All other divs are left untouched.

Ideal result:

<div class="pinkwrap">
    <div class="pink"></div>
    <div class="pink"></div>
    <div class="pink"></div>
</div>

<div class="red"></div>
<div class="red"></div>

<div class="pinkwrap">
    <div class="pink"></div>
</div>

Here's what I've attempted in jQuery so far:

var towrap = $(".pink");

towrap.each(function(){
    $(this).not(".pink + .pink").each(function(){
        $(this).nextUntil(":not(.pink)").addBack().wrapAll('<div class="pinkwrap">');
    });
})

This works, but if I only wanted to change the selector in my towrap variable without adjusting it in subsequent lines, how would I rewrite .not(".pink + .pink") and .nextUntil(":not(.pink)") to fit this?

What I've tried:

var towrap = $(".pink");

towrap.each(function(){
    $(this).not(towrap + towrap).each(function(){
        $(this).nextUntil().not(towrap).addBack().wrapAll('<div class="pinkwrap">');
    });
})

But this obviously doesn't work. Here's the jsfiddle. I'm open to any suggestions and links to previous answers in case I missed any!

I figured it out.
The solution was to declare the div as a string, rather than a selector: var towrap = ".pink";

var towrap = ".pink";

$(towrap).each(function(){
    $(this).not(towrap + "+" + towrap).each(function(){
        $(this).nextUntil(":not(" + towrap + ")").addBack().wrapAll('<div class="pinkwrap">');
    });
})

new jsfiddle