Explain she bore again from Genesis-when Eve gave birth to Cain & Able?...who was Cains fathet?

In Genesis,..when it reads she(Eve) bore again,is that referring to that Able being born 1st was actually Adam son-but then she gave birth again(implying right after Ables birth,...meaning they were twins of some sort but Cain not being Adams son,...instead implying that Cain was Lucifers actual biological son?