It's kinda ironic for Honoka to do something that Yamato did in the past. Remember, Yamato agreed to go out with Honoka during the time when things didn't look like they were improving with Suzuka. And even though it was obvious that Yamato still loves Suzuka, with Honoka awaiting for a response to her confession, Yamato deliberately agrees.
And now we have Honoka agreeing to go out with Mr. X just 'coz he confessed to her. It would have been fine if Honoka was over Yamato, but as we clearly saw in the last chapter...she wasn't -_-. Makes things a little sad. Well, a least things are finally moving along.