Also, I'm not sure what's going on with image #4 and why the thumbnail for it won't display properly, but if you click from image 3 to 4 it shows up. It's the first creampie shot, so don't overlook it.
Long story short, the guy having sex is the kid seen in p.5-7 grown up. His father jokingly suggested he have kids, his mother scolds the father for telling a young kid that, then they die. The main character is a bit of a kook from their deaths and from then on REALLY, REALLY wants kids, some baby mamas, and child support payments.