What really bugs my mind here is that the author is no amateur, yet made the huge mistake of making the new character more relevant than the bottom in a sequel. In stories like this, the main relationship should be the focus. It felt like she was so into her new character, she forgot all about Yoshino. Like ma'am, you should've jumped into a spin off right away instead of releasing this weird ass set up. Though I also blame the editor who okay'd this premise. Obviously it'd have a mixed reception.










He's mostly insecure rather than jealous. To the seme, he's the only one who takes initiative in their relationship. To top it off, the uke avoided answering when he asked if he felt the same way. So he doesn't feel special or loved.
Even now, the uke is pushing the communication card on the seme's initiative. He thinks he's been honest so far, but instead he's been an avoidance master. With no reassurance, the most the seme does is mention how he feels uncomfortable with the uke being touchy with others, but without explaining why.