Daniel's talk with the sympathetic priest in issue 6 who helps him patch up his broken relationship with his father is very moving and heartwarming. As is the end when his father, even though he still disapproves of his son's sexuality, pays for Marcus's college tuition so that he and Daniel can continue to be together.
I'd also add Ricky's speech in the final issue, if you ignore what he does at the end of it.
