>>/19/
Opps, that one isn't lolicon or erotic. This one is erotic though:

ティルアぱにっく:

#h-game #visualnovel
 
Description

One day, Thirua, a devil, turns Yuzuki, the main character, into a girl. He'll need to get back to a man in one month. If he fails, he'll never return to a man. Otome, his senior, knows it, and she takes him to her school dormitory. To get back to a man, he'll need to give Thirua some kind of sex energy every week. Yuzuki tries to save the energy in cooperation with the girls....

Notes: The main character is very feminine from the beginning, which is why the best pairing is with that cosplayer who sews her own clothing. (There's also a devil girl route.) As usual, the transformation process is nearly instantaneous. 

Developer:	Cocktail Soft
Publishing year: 2007

【18禁ゲーム】【071122】ティルアぱにっく 初回限定版 同封 Piaキャロットへよ\
I think this is a trial version of the game
pomf.host/download.php?file=wkoriz.zip

【18禁ゲーム】【071122】ティルアぱにっく 初回限定版 ダミーカット版 (mds+mdf+rr)
This is the full version, but you have to unzip the archives.

a.desu.sh/vxplqe.001
a.desu.sh/typqfk.002
a.desu.sh/lqkruh.003
a.desu.sh/rveomq.004
a.desu.sh/moauiq.005
a.desu.sh/lrbuwn.006

https://youtube.com/watch?v=KD0bU3TKK1k