In the Apocalypse, You Can Only Look at Me

One, two, three... Bai Aiyou, what are you doing? Hee-hee~ I'm counting little lambs! This one, Sister Youyou glanced at it; this one, Sister Youyou smiled at it; and this one, Sister Youyou praised it... Hee-hee! How can that be allowed? These people who attract Sister Youyou's attention... how can they be allowed to exist? You...!! [A knife to the throat] Sorry~? What can I say, you're Sister Youyou's ex-boyfriend! A moment later. Sister Youyou! I'm so scared! Everyone, everyone's dead... It's okay, Aiyou. They're all just cannon fodder. [Patting~] Hee-hee, Sister Youyou... You only need to look at me. You're only allowed to look at me~? P.S. A morally twisted story: an extremely doting bottom who seems saintly but is actually cold and ruthless, paired with a yandere bottom who seems like a lamb but is insanely possessive and adores the top.