Carnal Temptation

Hentai sisters are great! They always want to compete against each other and don't know the concepts of jealousy or monogamy...

"Prove it", eh? Yeah, if you manage to bait her into a Hentai situation, you've essentially won, or rather, done your job properly as a Hentai Protagonist.
Figures that his request would be sex though. What DID she think was going to happen when she inevitably lost?
Great ending though. It was pretty obvious the sister would find out, and I did think she'd be perfectly ok with it...But rather than just masturbating to it, why not go join in?

Whenever I see these storylines about proving how not horny they are by actually having sex, it makes me think of those tests they did back in the Middle Ages to women to prove whether you're a witch or not by drowning them.

Love the final panel with the elder sister spying on them.

Taking a bath, eh? They really are sisters, spying on each other. :D

I liked this one overall, but I'm gonna put this out there: The phrase "baby box" is a total boner killer.

Good sisters

Wow, that was good

This reminds me of scramble twins. One of my favorite hentai.

I want a follow up page where she breaks up the sister and him's fucking with a test showing two lines and her saying "What are you gonna do about it now?"

Uh, ... and unless my eyes deceived me, in the last panel on page 20, the elder sister (Kana) was silently observing the 'awakening' of Kaho's hitherto repressed sexual nature, and aparently enjoying the view.

DAYUM! ... what a way to debut on Fakku.

I guess it's not really cheating if the gf knows and gets off on it but I still feel like this should have the cheating tag.

I don't know where to start. Stockings! And I'm done.