Kiss x Sis getting a new fourth OVA release, it's also getting a TV anime-- in spite of being a pretty dirty little comedy.
The story revolves around a young man named Keita Suminoe, a third-year junior high student who's getting ready to start his exams to get into high school, but he keeps getting distracted. See, he has these two stepsisters-- twins, and slightly older than Keita himself. The two girls, Ako and Riko, have a naughty habit of kissing, fondling, flashing, and otherwise flirting with their stepbrother, who is at first disgusted with himself but eventually he grows to have feelings for them, which oddly enough their parents encourage.
So you could think of it as an ecchi seinen take on Marmalade Boy but with twins. It was created by Bow Ditama, whose name you may recognize as the guy who created the original manga of another ecchi comedy (and one I'm quite fond of), Mahoromatic, as well as the more recent Fight Ippatsu! Juuden-chan!!, also known as "that peeing anime on Crunchyroll." If that tells you anything about Ditama's style. I couldn't find a trailer for the OVAs or anything, but I did find this very brief little AMV, if you'd like to see some more of the visual style.
Right-o then, the TV series was announced last week and is currently set to air in the spring, while the fourth OVA was announced today and will be released with volume 6 of the manga this June.