Matthew's Links
[#complicated] --- At first, Ken is simply a trigger for terrible memories. Yet with those, also memories of trust and care come back, so he can neither dislike nor really distrust him. After quite some misunderstandings due to Ken not being used to 'normal human interaction' (after all, he's an experiment who was kept in a laboratory for a long time), eventually Matthew sort of decides to teach him how to fit in better. While Ken seems to like him the whole time over, Matthew has more problems with understanding what he himself feels. Over time, he gets weaker for Ken, yet can't really accept it as after all he still loves Erika. Only when Erika told him that it's okay and that he doesn't need to feel bad for liking both of them (and also that she and Ken get along nicely), he finally accepts it himself. He's still rather shy when it comes to being affectionate with Ken but doesn't mind when the other takes control, as he respects Matthew's wish to stop if it gets too much (...more or less, but not without pouting).
["Mine."] --- Ken is only interested in Matthew... or rather, almost obsessed. And yet, he's interested in the sort of different relationship of Matthew and Erika in comparison to his and Matthew, as it seems much more... 'normal'... so he doesn't interfere when those two are together. Rather complains to Matthew 'why aren't we like like that too, huh?' later on when they're alone.
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When Matthew finally accepts liking Ken, the latter of course uses his chances to show his affection, but respects Matthew's wish to stop if it gets too much. He still pouts about it though and complains how like this, it'll never get anywhere. (Poor, poor Ken.)