18+ Hahaoya ga Ero Ranobe Taishou Jushou shite Jinsei Tsunda

My mom, Mirei, wrote a mother-son incest ero light novel that won an award. For some reason, I ended up accepting the award instead. ...wait, what the hell?! And the high school girl author who also won an award is my crush... Ahh, I'm done for. My life is over.

(Source: Kadokawa, translated)