Should he impregnate his sister?

Yes he will. And more

John decided that he has needs to empty his still growing balls. But how? This small room can’t hold his massive load. John then snaps his fingers and makes his house a new basement. A gigantic space capable of holding his massive loads 10 times over. John impales his sister on his cocks and starts to brutally pound Roslyn's tight pussy. As Roslyn moans like a bitch in heat John snaps his fingers again and teleports him and Roslyn to the new basement. John continues to pound Roslyn his balls swell up almost triple the size as hot jizz Pours into Roslyn making her once smooth belly swell up rapidly. After what seemed like several hours John’s cum finally stoped. John looked at his handy work. Roslyn now bigger than a large house completely filled with John’s cum

But John is still just as horny, and his balls are already swell up again. Should he fill Roslyn even more Feeding her darkest and most **** kink or find a new target