An H2 BLOWJOB is a humming blowjob that does more than just get you hard, but, not enough to make you cum.
H3 BLOWJOB = The biggest and best Hummer there is, rich in cum-blasting pleasure!
H2 BLOWJOB = Medium Hummer; (1) Get hard, (2) Lots of pleasure, but (3) you'll have to move on to fucking to finish.
H3 BLOWJOB = Mini Hummer; you get hard, and that's it. Start fucking ASAP!