Hmmm ...since you are searching for Teen theme hentai animes I would like to say you that you can try out those animes which have school girls in it since they are all teen :XD:
But almost all the hentai got teen and schoolgirls theme in them so you can try everything out there but here are some recommendation if you want to try -
1)After class lesson
2)Sex friend
3)Temptation
4)Angels in the Court
5)Fruits Cup
normally you´re the only one to answer your question, as it mostly depends on your own taste. Reviewing that there are about 1,100 hentai / ecchi animes out there it´s too difficult to make any suggestions.
Perhaps you could look into ANN Or AniDB looking for the teen genre.