HailFire Hyperdeath & Dark Double Rainbow

(based off of an rp me and a good friend had :))
this is a multi crossover, fetish-involving fic involving smut, involving undertale, pokemon, mlpfim, touhou, and possibly more if i continue. if that doesn't appeal to you, then don't read this. don't come whining to me if you don't like the contents of this story.
also any fanart would be appreciated

main ships: asriel x utsuho x glaceon, and azzy x rainbow dash x umbreon

(note: in this story the adult, alternate universe asriel will be referred to as "azzy")
Edit: a few people at school wre saying its creepy that "young" asriel is married and has sex
it is NOT weird, because in this story he's the age of an ADULT, but his body just hasn't GROWN past being short!

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FETISHES INVOLVED: FLATTENING, INFLATION, TWISTING, and some MELTING.