ah i forgot to mark one manga...
omegaverse, 2 high school boys
the omega never use suppressant, he use his willpower, but then after met his alpha he cant use his willpower again and always looking for him, but the omega so clueless that alpha want to date him
http://www.mangago.me/read-manga/megumi_and_tsugumi/ hope it's this one you are looking for
Complete package manhwa: Hot, smut, FUNNY, nice drawing, sexy top and cute bottom.
Top has good personality (i mean he asking permission and wont do the minor that are point plus)
every chapter has me giggling and laughing at some scene