Eh, might as well. Would hurt to tell your own co-worker/partner/stalker/mate/rapist? Besides, what loyalty do you owe that stuck up bitch, Kaguya?! Regardless of rank, your orders come from the doc, the very lady who saved your life (in more ways than 1!). Honestly, you'd walk through Hell and back for Eirin... and you know sooner or later, you just might... probably to give Shinki a pap smear or something! (EWWW!!!)
By the time you made up your mind, you noticed Ms. Udongein Inaba dozing off, snoring quietly. As much as you were tempted, you dare not touch the bubble expanding and despanding from her nose as she breathed.

"Hey Reisen!"

"HM?!" your shout popped the bubble and Reisen woke up in a snap! "Um.... uh... oh! Yes, Alex? What is it?"
"Did you hear the announcement?" you asked her.
"What announcement?"
"Kaguya's dad is coming to town," so be good for goodness sake!

"??!!!" oh, that got quite a reaction from Reisen! Her ears went stiff straight to match the jaw dropped expression she's making. "...Y...YOU MEAN... EMPEROR HOURAISAN?!"
"Yep."

Seconds later, she regained her composure and started putting the medicine displays away! "Uh, emergency change of plans! We're closing the shop early today! Count the till quick! I'll put everything away!" Hm, she's quick to close up shop! What happened to that b.s. about working hard?!
You grabbed her arm in the middle of her rabbit dash across the room (almost burning your hand due to the sheer speed!) and stopped her!
"Wait wait wait wait!" you said, "stop right there! We cant close shop early."
"O-Of course we can!" she turned her head back to you, sweating, "uh um uh... I... I think my water broke! " Which is why there aint a puddle on the floor?!
"Youve been pregnant for almost two days... look, what's wrong? Is this about Kaguya's dad visiting?"

You hit the nail right on the head. Reisen looked around, making sure nobody else was around, then sighed.
"I'm... not on good terms with the Emperor..." she humbly admitted. Not that it surprised you.

"So? Youre not on good terms with the princess either," you said, "guess snobby attitude runs in the family?"
But the bunny girl shook her head, "No! No you dont understand. The man hates me. HATES me! With a capital H! All because I made one silly little mistake." Oh, this oughta be good!

"What silly little mistake?" you ask.
"Promise you wont tell?"
"I promise," you promised.
"Cross your heart hope to die?"
"And stick in a needle in my eye! Now tell me!"

Reisen paced around the room, trying to cool herself down before finally explaining.

"Er... last time he came to visit... I... kinda sabotaged his relationship with his last girlfriend..." Hm.
"How did you do that?" you asked.
"Well... when he came over to Eientei to introduce us to his new bride... I... sorta skipped out on my migraine medicine... I stumbled on her in the baths, bathing... and..."
You could imagine what may have went on at this point, but you let her continue! "Yeah?"
"...and... well, she looked and smelled really good... I mean REALLY good.... I mean REALLY REALLY good! Like 'cant keep your hands off' good! And well... I... um..." she swallowed hard trying to keep her sentence going, "...made her a woman before the Emperor could."

You kept a straight face despite inside you wanted to drop your jaw in shock! She RAPED the Emperor's bride!
"Wow..." was all you could say at this point, "you know what? For the sake of OUR baby, you WILL start taking your medicine."
"A...anyways, she freaked out, screamed at the staff, then told the Emperor that she never wanted to see him again..." Reisen's ears lowered with regret, "...and then I found out his bride was an ambassador of the Jhiroggnin Empire. Her nation took the silly mistake as a violation of their peace agreement and cut off all trade with the Lunarians!" SWEET SASSY MOLASSY!! Her mistake almost led to war?! There was next to nothing you could say about this. She screwed the pooch BAD. No wonder she's so scared of the Emperor.

"Aw c'mon! Surely he's gotten over it by now!" you lied. In all honesty, if you found out your co-worker raped your girlfriend, you would drop his sick ass on the spot and block his phone number!

"I highly doubt it," even Reisen wasnt gullible enough to believe that, "even if he did, I'm sure Tewi would remind him. The tattletale."
"Well, you cant just duck out!" you say to her, "I'm sure Eirin will expect the WHOLE crew to greet him."
"But he's too scary!" she whines, "I know the next time he sees me, he's gonna make a coat outta me!"
"Well, what are you gonna do? Hide?"
Reisen nodded fiercely, "YES! You gotta help me! For the sake of our girl, you gotta help me!" Damn it...

"What do you want me to do?" you asked her.

"J... just come up with a good excuse to give them!" she told you, "I've got a special emergency hiding shelter in my room that not even Eirin knows about!" Youre betting that shelter either looks like a miniature Caesar's Palace Colosseum... or a dark, damp room with pictures of you taped all over it! Another mystery of the world you dare not solve.

"Reisen... you expect me to lie to the doc and her financial providers?" You knew it wouldnt be a good idea. You owe Eirin better than that. Besides, if Reisen is on bad terms with Eirin's financial providers, you lying to them would only put Eientei in MORE jeopardy. The Yatagarasu taught you the hard way that you never EVER be tardy to an important party.

"Pleeeeease!" Then the bunny girl got on her hands and knees and BEGGED (and almost looked up your skirt!) "I am begging you! Just this once! I will NEVER ask you to do anything like this again!! PLEEEEEEEASE!!!"

Geez, she's really serious about this. You cant help but feel a little sorry for this girl. Then again, you cant help but worry what would happen if Kaguya & Daddy find out youre lying!