The song lyrics used here starts around 1:30 in the video.

"𝓣𝓪𝓴𝓮 𝓸𝓷𝓮 𝓵𝓸𝓸𝓴 𝓪𝓽 𝔂𝓸𝓾, 𝔂𝓸𝓾'𝓻𝓮 𝓱𝓮𝓪𝓿𝓮𝓷'𝓼 𝓲𝓷𝓬𝓪𝓻𝓷𝓪𝓽𝓮."

Bold = Giyū
Italic = Shinobu

» Shinobu «

"Giyū."

"Shinobu."

"How are you?"

"I was sleeping fine, thank you very much."

"You're very much welcome, I couldn't sleep."

"So you decided to disturb me out of all people."

"Come on, we haven't talked since new years! Didn't you miss me?"

"Oh has it been that long? 2 weeks only."

"Hey!"

"I'm kidding, it's new years and we all are busy so I didn't want to disturb you and of course I've missed you."

"...you're so cheesy."

"What? You asked, don't tell me you're embarassed now?"

"I'm not!!"

"Shhh."

"Ops, -ahem- I mean I'm not."

"Mhm, if you say so."

"What are you doing right now?"

"Sleeping, well, was, now I'm just laying down I guess."

"Hmm."

"Hmm."

"..."

"..."

"..............♪every stand up comedy
.....♪"

"What? Speak up."

" ♪ Just hoping that it will rub off on me ♪"

"Are you singing right now?"

"Shut. ♪ So you will smile at everything I say ♪"

"..."

" ♪ You got some soft lips and some pearly whites ~ pearly whites ~ hehe ♪"

"Mhm.."

" ♪ I wanna touch them in the dead of night ~ dead of night ~ ♪"

" ♪ Your smile ignites just like a candlelight ~ candlelight ~ ♪"

" -gasp- "

" ♪ Then somehow I know everything's alright ♪"

" ♪ Melting like an ice cream when you smile ♪"

" ♪ Melting ♪ ..

...you're a daydream..

♪ Stay a while ♪"

"Huh?"

"What?"

"Just now you.."

"I?"

"Uh nothing.. I must've heard it wrong."

"You should sing more, it's very nice."

"W-Well, obviously."

"Hah, it's getting late now and it's cold, think you can sleep now?"

"I think so, good night.."

"Sweet dreams."

beep...beep

"

I swear he wasn't singing there..."

"I should have recorded it."

"𝓦𝓱𝓪𝓽 𝓲𝓼 𝓽𝓱𝓲𝓼 𝓼𝓹𝓮𝓵𝓵, 𝓫𝓪𝓫𝔂? 𝓟𝓵𝓮𝓪𝓼𝓮 𝓼𝓱𝓸𝔀 𝓼𝓸𝓶𝓮 𝓶𝓮𝓻𝓬𝔂."