Author of this work is alfretori(あるふれっ鳥), you can find him and more of his works on pixiv and twitter. https://twitter.com/Alfre_Tori https://www.pixiv.net/member.php?id=2683969
Good i wish that 1. I could actually understand what these say 2. That Alfretori didn't lock a bunch of his stuff behind whatever that pixiv paywall bullshit they use