Hikaru sucking on Haato's finger. You have to make Hikaru a submissive. As for getting him to suck on Haato's finger... I usually do the action a few times and he eventually gets it (not sure if that's how it works, but it did for me)
Thanks for the tip! But what action am i supposed to do? :) You can't do the hand-thingy on the lips
OH! I just realized you can do the mouth thing on the finger... DUH :'D