Yoko Litner from Gurren Lagann, (in her teacher outfit but with her breasts exposed and pants down, glasses on) getting eating out while laying on her desk by an eager Nia Teppelin (adult version obviously). While she is getting pounded from behind by Simons cock.
Suzuka Gozen from Fate/Grand Order is getting pounded by a male anon from behind against a wall and has a ahegao expression sticking her tongue out. School Setting.
Reference for Suzuka Gozen: External
Nude or Slightly Clothed is up to artist.