1 shoot shoujo manga about high school girl fall in love with a sensei that pretend to look ugly in front of other to hide his handsomeness. i remember the girl confess to that sensei and try to make a hickey but don't know how to do it and ended biting sensei's neck, then that sensei teach the girl how to make a hickey.
//my english is bad n weird.. yes. i'm not sorry (● ̄(エ) ̄●)
1 of my fav mangaka Mitsuki Kako's work - http://www.mangago.me/read-manga/suki_tokoro_ni_yori_arashi/mf/v01/c003/3/
I'm searching on toonkor but can't find it :(