So the thing is; I don’t think Yuri has like a loli con sister fetish thing going on. As fun as it is to shit on him for it and as weird as it is sometimes I think he just loves her and because he probably has no/very little memory of his parents and he’s definitely never had a romantic relationship in his life the only person in his life that he loves is his sister and so my take is that his brain never actually learnt to differentiate between all the different kinds of love you can have for people.
Like ofcourse objectively he knows the difference between romantic love and platonic but also Yuri at times is still mentally at the childhood phase of I love my mom and I’m going to marry her because I love her so much and that’s apparently what you do when you love someone.
Because honestly if he really was weirdly romantically in love with Yor I don’t think Anya would bother him so much but like hes just as jealous of Anya as he is of Loid which would just not be the case if he actually knew how to differentiate between all the different kinds of love. If he really was romantically attracted to yor I think he’d make a bit of a bigger show to show how “fatherly” he could be (even tho she’s technically Loid’s child)
Yuri just really loves his sister like when little kids have feelings that are too big for them to understand or to explain or do anything other than experience them at full intensity. There is no one else hes allowed himself to share his life with in anyway. He has no real friends no parents or parental figures and he has no partner he literally only has his sister she’s his entire life.
And yor was kind of like that too in the beginning; wrapped up in Yuri. everything she did was to ensure Yuri didn’t worry it wasnt as intense as Yuri’s cause Yor’s not as single minded but like look at them in the last chapter Yor actually sets and enforces strict boundaries on Yuri and how he can talk about her family when just a couple chapters ago she let him talk smack about her fake marriage and fake husband in her living room and everything was an act to prove to yuri it wasnt “real” not really. But now Yor has grown she has let other people into her life it’s bigger and it’s settled in away that Yuri can’t push back against. And just like she’s always done as his big sister she is teaching him, modeling for him how to open up his life, how they can expand to include other people in this little world of theirs and they will still have space for each other that they’ll still have love for each other.
And yuri’s first instinct is to make their world small again to make it safe take them back to when it was just them so he can protect himself protect the space he occupies in Yor’s life. until he realizes that’s not making the world safe hes just sealing them in an airtight jar. And then he lets go as much as he can anyway even tho it’s just a few centimeters. He calms down and he goes home and I think the fact that he didn’t just stay home eating food that reminded him of his childhood of Yor instead he accepts the invitation, it’s why Chloe and his first commander are so important he letting his world expand just a little bit. That he gets the little sheets Yor wanted to get for Anya. It’s proof it’s all proof that Yuri’s growing up. Hes learning to let the life in.
He’s still very much a weird little guy though
