http://www.dlsite.com/maniax/work/=/product_id/RJ105818.html

Which character is the Gender Bender one???

Base +7, DarioEmpio +7

All of them... but again, without context, it just doesn't seem as titillating.

Base +7, Wexaplex +9, Guestoid +8, CWalkerz +6, stupid army -9

I would think it could be the one wearing a male uniform...
A look at the first picture seems to confrim this -.-

Base +6, jmd123 +5, Guestoid +8

Is Something

Base +6

Impossible to masturbate to 122, its just too damn funny

Base +19, SCSS +13, zigmut +9, lopopa39 +4, Gheist -7, davidor +9, molten1 +7

"Akira lived from day to day without any change.
Every day he protected his little sister from their alcoholic father.
School was a drag. It was a boys-only prep school.

"I hate this life!" he thought.
One traffic accident later, and he awoke as a female. (!?)

There was no way "she" could protect her sister like this...
unless she played to her old man's perverted nature.
"Well hello cutie, you want to take her place?" Akira's father offered predictably.
To spare her cute imouto, Akira spread her new feminine legs.
In spirit still a boy... and with his own father... it was
like a nightmare. But physically, another feeling took over...

Teacher and student, father and son/daugther sexual experiences.
Akira lives day to day with huge change. "

From vndb.org

Base +7, SilverWolf765 +10, stupid army +9, Nayabel +9, dementio +7, venom17 +1, SCSS +13, poyoray +5, Silver_F0X +7, molten1 +7, DarioEmpio +7

who is the artist ?

Base +12, timbus +10

http://www.dlsite.com/ecchi-eng/work/=/product_id/RE105818.html

Base +9

where is the pregnant images?

Base +9

This game has been fully translated into english by lv1 translations.
http://lv1translator.wordpress.com/2014/05/

Base +7, SilenceComes +6, wadarkhu +7, cdosbrother +6, davidor +9

Full english avaiable here
http://erogechan.com/download/seitenkan-ore-no-naka-de-ikeba-ii-daro.html

Base +6

(同人ゲームCG) [121123] [ディーゼルマイン] 性転換～オレの膣内(なか)でいけばいいだろ!？～

Base +6

I played this game, all i can say is it's sick

Base +5, davidor -9, lenzen +8, 6double6 -8, Luke2009 +6

electric shocks P53-58

Base +9