Just saw a translation posted today, without the raw around here...

Sources:
http://okashi.blog6.fc2.com/blog-entry-10286.html
http://okashi.blog6.fc2.com/blog-entry-10327.html

It was definitely made around July 2012.
If you have more infos about this, or find better sources, be my guest.

Chinese translation: https://e-hentai.org/g/521965/f93a81a54d/
Korean translation: https://e-hentai.org/g/976869/5d2f1582b6/

Artist's blog: http://surubure.sakura.ne.jp/

Dunno what series these characters are from, but the sister (Mika) comes in and finds him about to have his way with a girl and shouts Body Swap! and swaps bodies with him. Then decides to teach him a lesson by having sex with him while swapped. Except his body's demonic powers cause him to become a sex slave to Mika in his body, since MC was female at the time.

Base +6, Witty Name +4