Do you pull out or drain your fertile nut deep

Alright...so you couldn't resist the urge to determine your phase-sis naked. It begins off as playful sexual tension, but then as her clothing start to come off... it gets very real! Your Mind is telling you this isn't ideal, but your internal primal instincts would not cease her as she begins to stroke your difficult cock. Before you know it, she opens her mouth, and you're feeling her tongue all around your tip... then her legs unfold as she guides your throbbing meat into her swollen wet vagina. It’s all occurring so fast; you’re pounding more info her as she moans!! Your balls swell up with cum, therefore you hear your stage-sis say...cum inside of me! Would you pull out or drain your fertile nut deep inside of her?