I really can't understand a yandere's train of thought

He probably turned yandere or something and is trying to make tsukasa his in anyway possible

So he turned yandere WHILE he's in love with tsukasa??

He’s marked him without permission and probably he was thinking if he could get Him pregnant tsukasa can’t leave him

Wow that's just obsessive and very oppressive... Mofo that's just so unhealthy oml. I guess that's just the way yanderes love. Not like there's any irl, so that's a relief(￣∇￣")