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Who would it be? and don't be scared about the choice. Plus females can join in on the fun.

I would so Date, Hong Meiling!
Even if she is "Lazy" at her job, i LOVE her to death. A Braided Red Hair Maiden who uses Martial arts to guard a door and on top of that, Loves Rice. (I too love rice. Fried rice, with either Shrimp, beef, veggies, pork.)
I can imagine us sitting together outside in the snow while guarding the Gate. I would even wake her up before Sakuya gets to her (unless she uses Time to freeze my antics). I would even take the punishment with Meiling to show how much i care for her.
<3

Optional After effects:
1: If you were to cheat on your Wife/Girlfriend. Who would it be? Marisa is not a choice at all.
Parth: If i had to cheat on Meiling....I would kill myself first! I dare not want anyone else! But if i was forced i would try Aya (Tengu Women are hot. I can admit it.)

2: Your wife/Girlfriend wants to go on a seven day vacation! She tells you nothing about where to go but you have a feeling she wants to go to a special place. Where do you take her and what type of room would you get?
Parth: I take Meiling to Vegas and i would get her a Suite room. each night i would show her a special place after some fun at the casino and dinner. Leading up to a proposal in public.

3: Where did you meet your Wife/Girlfriend? and how did you two fall in love? (can be in the outside world as this is all fantasy.)
Parth: I met Meiling at the front gate of the SDM, a frown on her face and a knife in her head. I asked her her problems and until i asked her out on a "Date" i talked to her anytime i could.

We fell in love when i realized i failed to cook her favorite meal. i tried to impress her with it but The rice was a bit hard and she had an "Ew." face on. She at it all anyways and she cheered me up with a kiss. The rest followed up with more kissing and confessions

Byakuren all the way! I don't know why I love her so much but I would yuri her face. (overshare)

Flandre Scarlet?
or is it Mokou?

Just one? crying
Well, Alice is my 1st choice and Byakuren is my 2nd...but since they were already chosen, I'll go with Koishi. I don't know why I like her so, there's just something that draws me to her. Maybe she's manipulating my subconscious desires 3nodding

Well, I WOULD have said Hong Meiling as well, but somebody beat me to it! xp

My second choice though, probably Yuyuko. Pretty, pretty funny, like foods (more than I do obviously confused ) and has a sweet, yet dangerous cherry blossom tree. Plus I really like her personnality smile

Sanae, just got to be careful and not upset her guardians...and while I'm at it, Kogasa would be my little sister.

The one that got me into Touhou, Remilia Scarlet.

Heh....nailed it in the first go dude.
Of course.........A flower(Yuka) is fine too.