I thought it served a really good purpose, to show why MC and Vera don't overindulge like that in the future. It's a tragic lesson learned. They both messed up, and they both feel equally ashamed, as they should. It also serves to show the player that bad things can happen. Maybe MC could have been portrayed as being less in control of himself so it was a little more obvious that he's making a mistake he'll regret. Vera is portrayed exactly like that, which makes it seem a little less like they are equally complicit, as they are.