This part of the forum apparently lets you "find" manga, but I can't find the one I'm looking for.
Here's the Description: Girl wants to make the basketball team and the coach/teacher tells her that if she can't make a shot with him grabbing her boobs then she won't make it. Then sex. The art looked like Pisu Hame! by Shiwasu no Okina if that helps. The art may look a little different maybe. I read it on fakku so I know it's here somewhere.