Responses
Uhh, have you read Hana to Usagi?
http://www.mangago.me/read-manga/love_monster_mio_junta/ - private tutor
http://www.mangago.me/read-manga/young_bad_education/ - deliveryman (second story)
I'm searching for manga(yaoi/shounen) with private tutor stories (like: Katekyo). And yaoi manga with delivery man(seme/uke)