alice heard a sound of rapers so she killed them all and after that she found her kid while she was horning but she remember it was her kid and nothing happen good end ???
Close, but not exactly. From what I can tell about previous works, the Marisa is actually Alice's partner, but is small enough to look like a child I suppose.
In order to revert RRA back into a normal yukkuri, the Marisa, well, sucks Alice off.