There is no hope for her.

Swapping Bodily Fluids.

You're doing it Wrong. You're doing it very, very wrong.

Does she know which mosquitos bit naganami?
If not, it is pointless doing so.

It's pointless anyway. Since the mosquitoes don't release blood. They release something else, which works as anesthetic. Even if the same mosquito bite them both, nothing means nothing.

Beware of Mosquitoes

Krugger said:

Beware of Mosquitoes

No worries. You can blow them away in one punch, man.

Mark but this flea, and mark in this, How little that which thou deniest me is; It sucked me first, and now sucks thee, And in this flea our two bloods mingled be; Thou know’st that this cannot be said A sin, nor shame, nor loss of maidenhead, Yet this enjoys before it woo, And pampered swells with one blood made of two, And this, alas, is more than we would do.