Ookii Kouhai wa Suki Desu ka? - Vol. 3 Ch. 37 - The Peach-colored Days, is Her (Kouhai) Color.

[Vengy5]

I sense something; a new manga/anime trope I have not felt since . . .

 

[chusetto]

Ookii indeed

 

[Kuokkanen]

Why Oomori-san can't look?

 

[petaszetas]

Good job, imouto-chan. Nice assist.

 

[Giggleplex]

Booba

 

[Juggernautbob]

Wakes up from dreams where he's surrounded by boobs
Immediately gets a glass of milk

It's just the natural desire to drink milk after seeing milk containers