Iyagaru Imouto wo Oshitaoshite Iroiro to H na Koto wo Shitai! - Vol. 1 Ch. 9 - Secret Lessons with Sensei

[MangaDex]

 

[Gian]

Man, I wonder what grade she's in or what age she is. It's barely mentioned at all.

That aside, it's a very nice loli anthology overall. Some (not me) might not like all the oppai lolis, though.