In this story, the Father-in-law suffers from impotency so he resorts to aphrodisiacs and drugs. She puts the poor daughter-in-law to the mix drugging her up into a sex-crazed girl. Full blown NTR.
This girl Misaka Ria (御坂りあ) is a rookie from MOODYZ which looks really good.
Her twitter @nax_riamisaka just has 5K followers but it looks interesting, she keeps active enough.