Answer carefully, or you might not see the sun again.

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Polarisonok said:

"Yuuka, I promise I'd never cheat on you." *Hugs her*

Now that just sounds suspicious.

[deleted]

I'd tell her it was a friend asking for directions. I can't really think of a coherent and "correct" response since I can't imagine not being single in the first place.

The first thing I would say is "Really? Really, Yuuka? You're not a second place, but the first one. And get it together: you aren't replaceable.".

If I die after that... well, at least I made Yuuka jealous

"Relax, Yuuka. It was my sister. Not like any girl other than you or a family member would talk to me anyway."