Does one pull out or drain your fertile nut deep

Alright...so you couldn't resist the urge to see your phase-sis naked. It begins off as playful sexual tension, but then as her apparel start to come off... it receives really authentic! Your Mind is telling you this isn't correct, but your inner primal instincts will not likely end her as she begins to stroke your tough cock. Before you comprehend it, she opens her mouth, and you feel her tongue around your idea... then her legs distribute as she guides your throbbing meat into her swollen damp vagina. It’s all occurring so rapid; you’re pounding her as she moans!! Your balls swell up with cum, so you hear your action-sis say...cum here inside me! Do you pull out or drain your fertile nut deep inside of her?