^ Merryweather's twitter account was created in 2014 whilst the first Neptunia game came out in 2010
The first major Anthropomorphised thing he made that I'm aware of is the Internet Explorer comic that came out in 2018. And as far as I could find the Console anthros came about around early 2020 late 2019.
That is to say, Merryweather's anthro console stuff came about roughly a decade after Neptunia started.
Akshually, thy/thine works like a/an, where the first syllable of the next word determines which you use. Futo should only say "thine heart" if you think it's correct to say "an heart".
So, for a while now I've had in my mind an idea for a fanfic that's kinda this pic, except Bocchi and Ryo are having an intense, private, sweaty, sensual, 1-on-1 jam session.
^I don't have either of them so I could only I know from screenshots but I think it's one of Trigger's trust events in Lumina Square where she and Yanagi are buying red bean buns.