Anyone knos where this is from?

This is from chapter 1 of Kaichou no Iinari! by Syati Kamaboko (pen-name at the time of publication). They currently publish under the name Sakamata Nerimono.

This panel is in chapter 24 of the linked work.
https://hentai2read.com/kaichou_no_linari%21/1/24/

Further info:
https://myanimelist.net/manga/22976/Kaichou_no_Iinari

This is from chapter 1 of Kaichou no Iinari! by Syati Kamaboko (pen-name at the time of publication). They currently publish under the name Sakamata Nerimono.

This panel is in chapter 24 of the linked work.
https://hentai2read.com/kaichou_no_linari%21/1/24/

Further info:
https://myanimelist.net/manga/22976/Kaichou_no_Iinari