Looking for a story: female to futa blowjob

Story by GALVANIZER

I'm looking for a story I've read times ago which I can't remember the title.

There were different chapters and in one of them the protagonist (a woman) meets a futa randomnly on the streets and ask her to give a blowjob. If I remember right she kneel down giving her head while the futa is standing laying against a wall.

Someone has an idea?