Homestuck peeps, what is the general consensus (or your own personal theories) on Trolls having boobs? Because, I mean, their biology is pretty wtf anyway, but it's handwavey enough that if I don't think about it, it doesn't actively bother me. But Trolls having boobs bothers me! Why would there be boobs when they are not mammals??? This makes my head hurt! Are there any fic or meta posts that try to make it make sense? Because I am willing to be persuaded by handwavey biology if it seems plausible (and in fact, would like to be persuaded, just so it can stop making my head hurt!). I just can't seem to think up anything on my own.
(Though if I ever write fanfic or draw fanart I will just ignore that fact and use my headcanon of no boobs. Just as it seems everyone else has used their headcanon of Trolls having tentacle-crotch syndrome, despite "bone bulge" not really making sense as a word referring to tentacles.)
ETA: Since apparently this is not clear, my question is not "do trolls have boobs?" My question is, does anyone have any thoughts about making sense of Troll biology?