And it looks like the S5 now comes with 5 seats/belts.
If the current S5 had 5 I would probably already have one
http://www.caranddriver.com/photo-gallery/2018-audi-a5s5-sportback-official-photos-and-info
If the current S5 had 5 I would probably already have one
http://www.caranddriver.com/photo-gallery/2018-audi-a5s5-sportback-official-photos-and-info