This was... Nice? I'm surprised honestly (°ﾛ°٥) It's been a while since I've read a "non-toxic" manga (even doe this also has a rather questionable trope xD) and I rlly like it lol. I like how their feelings were mutual immediately and they respected each other idk, there wasn't this usual thing where the mc just denies their feelings for 3 chapters first lol. It was really cute, the way the big bro just cheered for the lik bro and their relationship and bickering was fun to watch. During the kiss scenes it felt like I could really feel their passion because both just really longed for each other and it wasn't this one-sided, one person initiates everything, typa thing
Kyoudai no Rule