You forget one of the important mechanics of Gensokyo. The reason why thinks work inside the Border is because the outside world believes it can't, and those in Gensokyo believe it can.
The outside world knows two women can't make a baby. Inside, however, if Alice manages to gather enough faith...
Glaive_21842 said: wait a sec... Marisa + Alice = Rumia?
I think it's suppose to be PC-98 Alice.
X year, Y month, Z day
Marriage
yaaaay, clap clap clapOh, Marisa ...Marisaa ...Marisa ...You're so beautiful, Alice ...Love ya, Alice ...She's so cute, she looks just like you, Alice.Scary...Alice's
Life PlanDo not read!〇 year, △ month, 口 day
Marisa and I become one♥
Eeee!A year, B month, C day
Birth
She's our child, so she's definitely the most beautiful one in the worldSince that day, Marisa stopped stealing other people's precious things.