As they didn't even try to keep it down I was surprised Mom didn't know what happened. Either way it's nice to see a young couple figure out what turns them on together.
Well, the Relationship Upgrade took place at warp speed, although perhaps neither Emi nor Motoyuki were mentally prepared for it. But it could hardly be helped once Motoyuki got to that age where he stopped seeing Emi as just a "big sister" and started seeing her as a "Sexy Onee-san".
Well, guess we'll wait to see what "#2" has to reveal, won't we?