I don't think that's a good idea?
omg no!
Even putting the yaoi thing aside, if he told you to do a BOOK report, I would not risk doing your report on a manga. If you CAN (ask him first) and you really want BL, do a shounen ai or something that doesn't revolve around sex. Sex is a huge part of the plot in "Darling" and you'd have to write a LOT about it, and I don't think that is something that you want to communicate with your teacher.
If you want a good BL book I recommend "Openly Straight" by Bill Conigsberg. It's funny, romantic, enthralling and heartbreaking. I'm still on the edge of my seat waiting for the sequel that's coming out at the end of March.
*Bill Konigsberg
Dang autocorrect. Seriously, though. First impressions are important, and this is not a good way to start a professional relationship. If you were really close to the teacher then maybe I'd be more lenient, but as this is someone you've only recently met then I seriously urge you to reconsider.
That's a bad idea... I know you love yaoi and all, but there's a possibility that you have to do a presentation in front of all class, and picking that book would only resulted in social suicide.
Please pick another book that is more academic. If you want something more BL-ish, I'd recommend The Song of Achilles—it's based from Homer's Illiad, which has a historical and mythological roots.
You want to write a report on a yaoi manga without talking about sex? That's... ambitious (⊙…⊙ )
Idk how you managed to write a report, then. I hope you didn't have to give the title because teachers tend to do research on books that are mentioned in the report. I just wouldn't have done it if I were you. Might make for an awkward relationship with your teacher because if you gave him the title then he 100% knows what "Darling" is about.
im doing a book report and since i just got here the teacher is letting me pic the book so i picked Darling http://www.mangago.zone/read-manga/darling/