I appreciate that this is one of those rare futa doujins where the plot isn't basically "Holy fuck, dicks are AMAZING!" But on the other hand the presence of the dick is a bit baffling as there's no real reason for Rin to have one in the first place. You could do the exact same scene without it, and nobody would realize. So...really, why bother?
Why does futa get scrutinized so heavily compared to other kinks, geez. You barely ever see comments like this on basically any other tag, yet every futa doujin I click on will have at least a couple of people asking why it wasn't just 'regular yuri' or whatever.
It might be a bit shocking to people on here, but there are authors who like to draw futa - some prefer to draw it over vanilla yuri or het, some just like to draw it alongside their other works. So they do. it's literally that simple. They liked the idea of a futa story with Maki and Rin (not a yuri one or a genderbent one or anything like that) so they drew it.
And people saying "hurr the author only picked rin cuz she looks like a guy!" are really reaching hard for something to criticize. Not only has Bocha drawn vanilla MakiRin before (so it's obvious they're just a fan of the pairing in general), but there's plenty of futa Love Live doujins about basically every girl and pairing, yet as soon as it's the tomboy it's suddenly a grave sin? (lol who am I kidding, futa itself is a grave sin to a lot of the more fanatical yuri fans anyway)
Like, just stop. It's a kink. It's a pretty damn popular kink in ero doujins. There's likely no deeper meaning to any of this besides the author finding a futa ver. of this particular pairing hot.
Also sorry if this got a bit heated, it's just been bubbling up for a while since it seems there's the same damn comments and criticisms (or outright bashing) on every futa piece -_-