Carl, he's a friendly guy.

You realize quickly after your son's birth that the father of 'your' child is none other than your friend; Carl, since every other guy your wife sleeps tends to use a condom.

Heather picks his name without your input, deciding on 'Henry'. Even though he isn't related to you, you end up treasuring your son; especially with all the time you end up looking after him by yourself while Heather is 'visiting the neighbors'.

By the time, your son hits puberty, he is established as a charismatic, optimistic, laid-back young man, well loved by his peers and adults alike. As far as you know, he doesn't have a steady girlfriend, or dates anyone regularly. A few days after his 18th birthday, however, you come home early from work (and Heather is out), to hear strange sounds coming from Henry's bedroom.

Creeping up the stairs, you listen in and realise it is the sound of your son getting a blowjob! Yes, that's right, you hear the sounds of a wet mouth sucking a penis - and Henry moaning encouragement!
"Ooooooh yeah!! This is so good, suck me, suck me! You're such a great cocksucker! Ah! Ah! This is the best blowjob I've ever had!"
You quietly peek inside, curious as to who is giving Henry the blowjob...