Its a very funny ecchi-comedy anime, making you giggle most of the time because of the situations Kanna goes through in getting the job done for her sister. But there are the WTF moments where Kanna gets "too much" into the groove... entering a trance like state where she gets a blank look in her eyes while doing erotic voices and moans, licking and slurping, and climaxing... literally.
The character design and animation production is average... very nicely done, but suits the theme of the anime very well. The two-episode OAV handles the pacing of the story very well, leaving no dull moment, without sacrificing the flow of the story, and not spreading the plot out too thin.
I would recommend this one for light viewing, but due to some hentai scenes imagined by Kanna (although censored), a bit of restraint is advised.