http://www.dlsite.com/maniax/work/=/product_id/RJ034829.html

First entry in FakeReal's "Big-Breasted Series" (巨乳なシリーズ) from 2007.

Second entry can be found here: /g/321679/a2a3f800b8/

001: title
002-153: text
154-305: no text

I don't see any Mahoromatic / char:mahoro andou here, voted down (I think someone confused Siesta with Mahoro). But - who's the red haired chick (p.174)?

Base +49, tentacle-man61 -23

@Red_Piotrus: Indeed, this is purely a Zero no Tsukaima work. The red-haired girl is Henrietta in "commoner" attire, I believe from when she was hiding from the castle guard.

Base +5, tentacle-man61 +23