Note: Originally self-published under the name "Arofou Dokushin BariCare Oba-san ga Yuujin no Musuko demo aru Toshishita Danshi to no Kankei ni Hamaru Hanashi (アラフォー独身バリキャリおばさんが友人の息子でもある年下男子との関係にハマる話)".