What if all along the older brother was the one manipulating everything, like how he made his younger brother aware of him to the point of obsession....
By reading the recent chapters I can feel that the older brother is not interested in other people aside his younger brother, but he still has to act as a normal older brother as a cover from his parents and other people.
I just want to know if the potion's effects will wore out....
It would be funny if it didn't really worked out earlier in the series and Alec just likes him genuinely so he just made this excuse of being under the potion's effects.