looking for an old manga that used to be on Hentaischool.com back in the day. where the main female lead looks similar to Ryoko Hakubi from Tenchi Muyou! or at least style, cant be totally sure if that what she looks like but it what comes to mind of the style when i try to recall it. i cant remember fully but seems like that, and the girl was a biker of some sort? she would visit his house/apartment coming and go and every time they would visit they would have tons of sex. there was also other girls that would join or be added to the story as it went along. the guy was slowly falling in love with the girl but she would leave and not come back for a long time. than back and forth for work or just going on "trips" than coming back, and helping the guy "relive how backed up he was"
found it