2 Sons, 4 year old and 2 year old.
I didn't want any kids, I'm a self serving mofo. Wife talked me in to 1. She got pregnant the first time we had sex with no protection. After my son was 6 months old she asked me when I was getting my Vasectomy. I said "Lets have 1 more, lets start trying now." and she flipped out. I just really love being a dad.
Now, that said. 2 kids is about 500 times harder than one, at least at first. They are just now getting to a cool place where they can play with each other, and I rarely have to deal with one screaming and crying and knocking a glass off the table shattering it, while the other is shitting on the carpet and then walking through it and running from me, leaving shit footprints everywhere. That really happened one day. I have no idea how anyone manages being a single parent.
But for every nightmare story, you have like 1,000 moments where you go AHHHHHHHHHHH and want to just cry at how happy they make you.
Just last night I was up at like 1 a.m. playing some Minecraft in my game room, and my 4 year old walks in half asleep. I said "Hey Buddy, what'cha doing?" and he walked over, hugged me, and said "Knuckles". So I fist bumped him and he walked off saying "Love you daddy" and went straight back to his room and passed back out. Just a little thing, but makes you feel like king of the world.