I adore BL novels so much! I can read them from the evening through the whole night till sunrise! Great plot and characters that will give you a myriad of emotions. They'll make you laugh and sometimes cry, feel a warm atmosphere, be excited by the storyline, and be embarrassed as well. You must read them!
Besides, I put here only those novels which are perfect in everything. If I dislike the plot, character, or atmosphere (relationship), the novel won't be on this list.