I found several videos of various chubby/fat girls with their zipper down, enjoy
youtube.com/watch?v=j8i1UIe5awk
youtube.com/watch?v=U98BXueMUuc
youtube.com/watch?v=yf_EgFbFGY8
youtube.com/watch?v=Q38LNOAgyew
youtube.com/watch?v=WX8oNj2H7H4
youtube.com/watch?v=HOiZi8-rblA
youtube.com/watch?v=xNGXqViykTI
youtube.com/watch?v=07GfBMrjgZI
youtube.com/watch?v=rmiXP_BbuZ0