@Usako: Lil bro does like nii-san, but it reallyyy looks like nii-san's gonna be with Mitsuya O:
@Sakura
1) The knowing look lil bro has here O:
http://www.mangago.zone/read-manga/kitto_kiss_o_suru_toki/mf/323395/Ch2/pg-4/
2) The repetitive questions he asked
"It's because you were shocked, right?"
"You saw me and Micchan kissing, and it shocked you, right?"
"Yeah, we weren't actually kissing. But it looked to you like we were, right? And you didn't like it, did you?"
"And... ARE you fine with it? Really?"
It's like he was trying to make Shin realize that he likes Mitsuya.
Which he succeeds in
Shin: " ..... Satoru's right. I didn't like it ......"
3) Mitsuya pretty much repeated what Satoru said here
http://www.mangago.zone/read-manga/kitto_kiss_o_suru_toki/mf/323395/Ch2/pg-24/
Whichhhh causes them to kindaaa kiss
Lil bro blocked the kiss and took Shin away at the end though, and I'm guessing Kanda-sensei plans to make the manga a bit longer/not that easy by using Satoru as an even bigger stepping stone
(=・ω・=)
(This is gonna be embarrassing if sensei has a plot twist and lil bro ends up with big bro ;-; If big bro does end up with Mitsu tho, then lil bro reallyyy needs a sidestory)

From what I see, the lil bro is pushing the story forward for them
(๑•ㅂ•)و✧