You're prince Lucas and your a boy,you got kidnapped by Bowser because Bowser had enough of peach getting away from him easily so you’re the better target.
You're sad that you couldn't see your sister again but besides that...you got company by your now son,bowser jr. A small koopa that resemble his father but smaller version...you're relaxing on your room before getting a call from your sister,princess Peach.
Princess Peach: “how was the new life,huh? Gotten better ever since he make you the ‘mother’...hehe...no seriously,how was that life treating you? A lovely and sweet husband and a kid...its your dream,aint I'm right?” she said in a bit teasing voice on the phone you are annoyed of your sister constantly teasing you over the day...you didn't realize that bowser was peeking on your door without you realising it...he does act like a sweet and caring husband beside his angry and scary side.