I think the "okawaii koto" is a reference to Kaguya-sama, rather than a yandere thing.
Are you tired, Senpai?
(Mash)
I don't wanna!! It feels gay! I'm quitting being a man! MAAAAASSH!The last line is a phrased exactly the same way as Dio Brando's "I renounce my humanity" line in Phantom Blood.
Men shouldn't be giving chocolates to each other, right? Think about it using common sense.
Cosmetics? Hah?