re: WHAT'S WITH THE WEIRD RED SUN OVER DAVE'S APARTMENT

Imo it's goetse. Like big red asshole in the sky. Hussie finds people being startled by pornography amusing, be if Clover catching a glimpse of DD's nudie rag or the little elf in Jailbreak catching a glimpse of a penis from some gay porn and beginning to cry. Dave having a big red asshole in the sky reinforces the general state of having gay porn laying around the apart and makes that bit where he rhetorically locks Terezi in his grill so she is privy to "the brown side of my burger" a really tidy meeting of her sun trauma and Dave's proclivity for ass jokes.

Incidentally, I think this is also why right after John looks at the sun with his telescope, Rose rips the toilet out of the house. Sun:asshole::eye:toilet, so John was symbolically blinded by the encounter. Thus Terezi starts talking about how she went blind after rupping Karkat's toilet out