We all knew that the imouto was going to be a yandere & - TA-DAH! - here she is in all of her 'formless pools of darkness'-eyed glory. It's always comforting when a fundamental truth of the universe is confirmed before our eyes.
So if I were the MC right now, my harem assembly order would be:
Masochist
Imouto
Twin brocon onee-sans (even though I haven't met them)
Loli-senpai (yeah, I'd NTR my bud in the blink of an eye, he's trash anyway)
The fujo, snifferoo, & sadist would be pushed toward Truck-kun.