I thought this meant seme is coming out clean and finally letting the uke get rejected(obviously) by his sister before getting too deep into the relationship. As if he was helping the uke let go of the delusion that he has a chance with the sis. And if possible, realize the actual "feeling" he has for the seme, be it curiosity or genuine affection. But, the comments below are stating something else so gosh, hope I'm not wrong with this evaluation ┗( T﹏T )┛
This chapter made me remember that disgusting shit again! WHYYY (╯°Д °)╯╧╧