1. shorter and violent seme (otona keikenchi is a good example about violent/sadist shorter seme)
   or
2. seme uke change roles, no one really uke or seme :3 (The Carp on the Chopping Block Jumps Twice for example)

I really want to read manga like these xD if you know please suggest me x3

Thank you.

http://www.mangaupdates.com/showtopic.php?tid=22146&page=1#post422876
and check this http://www.mangaupdates.com/showtopic.php?tid=12898&page=1#post423823 😛

um.. they are not exactly what Im looking for. I've tried almost of them too ^^
Thank you anyway 😀

Btw, no student-teacher relationship and models, please 😀

2. try out manga by Sadahiro Mika, most of her couples switch the uke/seme roles. In Haru wo Daiteita the couple switches roles a handful of times. And look up Reversible Couple in categories

Thank you xD Im reading Haru wo Daiteita now :3