is it a small curved dildo that have some animal-shape head or something? because I am looking for this manga too. it's really cute but I've forgotten what kind of animal... could be a panda bear? I remember at one time the seme's classmatess came to his home and they all forced the uke into a girl's school uniform. the seme did not stop them because he wants to see uke in girl's uniform too. if you found the manga please inform me...
this is it thanks
Its this one http://www.mangago.me/read-manga/kawaii_hito_konno_keiko/ the part with the girls school uniform and vibrator happen in chapter 3. :)
looking for a manga however all i remember is during one part the seme's friend gave him a vibrator saying that its amazing to use during sex.