Makoto wants to develop his way of expressing himself. He was on the school's rooftop with Kotonoha when he tried to get close to her, but didn't expect for her to turn him away. As that things didn't go so smoothly, Sekai turns to Makoto, and makes a proposition...
@canyousaypothead
I definitely agree, everyone has to start somewhere. It is not like this stuff is widely talked about among guys, (or at least not from my experience). Got to fail before you succeed.