Whereas the cuter one on the right just looks bored.
Story of all of our lives right there. Crazy, bat-shit insane chick loves the cock so much she'd like to chop it off and store it in a vat of her own urine in the fridge. While the one you'd really like to fuck just looks on ever so slightly amused, but not so much to show it.
And you know .... mom in the middle.
This picture is very Freudian.