Sweet color release! I think I know where I've seen these girls before..Don't ask me I why know this. If I'm not mistaken they are from the visual novel "Motto! Haramase! Honoo no Oppai Isekai Ero Mahou Gakuen!"
3 pages of coloured goodness...Also that's quite the title.
Actually, seeing the Mash looking girl made me realise that this is probably based on the eroge:
"Motto! Haramase! Honoo no Oppai Isekai Ero Mahou Gakuen!"
I remember they had posters up to advertise the game and people were wondering why the girl (Her name is Fii) looks so much like Mash, except she just has bigger breasts and a different name.