published on: 2012-06-24 18:41:45
we-just-love-boys.tumblr.com/post/25789014311/
we-just-love-boys.tumblr.com/post/25789603721/
▲= b² - 4.a.c
we-just-love-boys.tumblr.com/post/25797538895/
we-just-love-boys.tumblr.com/post/25802382046/
we-just-love-boys.tumblr.com/post/25806630142/