Bart's relationship to all of his civilian friends is really something that is god-tier, but his relationship to Preston really gets to me. Particularly when Bart really does go above and beyond just to make him happy.
I think back to Impulse #51 where we see Bart become interested in comics through Preston, and we also see Bart being a great friend by being attentive and just wanting to make Preston happy.
We find out that After-Life Avenger is a major fictional super-hero and comic in their world with Cherub as the main sidekick, it is Preston's favorite. Preston doesn't have issue #16 and he says he would do anything to have it. It is listed with a price of a whopping $23 in 1999 which in today's money is $30.72 - that's pretty steep for a single issue.
When asked what he was going to get Preston for his birthday he at first was completely blank until Helen helped him remember the conversation from earlier and he tears off of a mission with only one end game; to get Preston that rare comic only because he knows it will make him happy.
Look at how happy Bart is at having been successful in finding this comic, look at his face, look at his little daydream. He literally only wants to make Preston happy.
Also a side note we never find out how much Bart actually paid for this comic (or if he exchanged any cash for it). Bart's strongly hinted through his comics that Max does give him an allowance and Bart is shown buying things like snacks, games etc so he likely would have enough to buy it.
Also, as I like to say. "There's a lotta loose change in the world."
Either way Bart spent a long time finding it having had to go all the way to Seattle, WA from Manchester, AL to find it.
There comes a point in the comic where Bart is left with an opportunity to impress Preston by providing him with an even rarer Cherub figure when he finds it while cleaning up after a heist he apprehended. Instead of thinking about keeping it for himself due to its high collectable value, Bart's immediate thought is giving it to Preston and how much that would make him happy.
Ultimately Bart decides against it, as it would not be fair, but he did in fact think about it at first.
Bart does so much for Preston in his comic; everything from being willing to out himself as Impulse to report his abuse, performing petty crime, running around everywhere to find a comic he knows he will like and being tempted to blatantly steal for him.
Bart loves his friends so much.
