No, the condom stays on...barely.

As she K.O.'s your character you drop the controller to grab her hips and really give it to her.

She giggles. "Go for it Jesse! Fuck me! Show me what you got brother!"

As you slam into her you are right on the verge when you feel the big condom beginning to slide off. You are just barely able grab it with your fingers before it comes loose. Gripping your shaft you finish your final few strokes and let loose your nut into the latex protected pussy of your little sister. You grunt and groan as you let it go.

"Fuck!" You exclaim. "That was awesome." You pull back and slide the loose condom off of you.

Elsie rolls over, you see her huge still mostly erect messy cock covered in her own cum. The wet gooey mess is all over her shirt and the sheets as well. She looks up at you. "We're going to have so much fun big brother!"