So...

and yuta being hard headed will got ono like :

Yuta insisting so much and saying at least just once
Ono eventualy getting so feed up with it all he tries to scare Yuta saying he will do it once but only if Yuta accepts to bottom.
Then Ono gets surprised because Yuta agrees and we get to that point when they say to each other that something happened between Yuta and Ono because now that Yuta had bottom to Ono, he doesn't want another life nor another person. But... He still needs to convice Ono to marry him