cherri's manga / #yaoi(188)

I read this book a few years back and like it but now that i've re-read it the first store is fast paced with no chemistry. The relationship between the younger brother and his teacher is just creepy tbh. the chapter were the four f together just leaves a bitter taste in my mouth. how can you be okay doing such things in front of your younger brother and how can you allow and support him dating a man older than your own boyfriends?