ABC

So, we don't know about you, but the only thing more shocking about Bianca (Eden Riegel) coming back to the show pregnant was the fact that she was knocked up by Zach (Thorsten Kaye), her brother-in-law!

Not in the most traditional sense -- Bianca's a lesbian. In fact, her partner Reese, is soon to debut on the show (next week, kids) played by the amazing Tamara Braun. So Zach was just a willing sperm donor. But here are the two odd (at least, to us), unanswered questions that are making us pull our hair out:

*Why would Bianca get Zach to agree to give his sperm, and then never tell him she was impregnated?
*Why would Bianca and Zach keep the "Zach's going to be my baby daddy" info from Kendall?
Also, is it weird that Miranda's new little sister is also her cousin? Whatever, this is Pine Valley, that's nothing.

We know the reasoning behind this will come out. I mean, half the fun is figuring out why. But we want to know your theories on the why. Spill below!