Do you pull out or drain your fertile nut deep

Alright...so You could not resist the urge to find out your stage-sis bare. It starts off as playful sexual pressure, but then as her outfits begin to occur off... it gets incredibly real! Your brain is telling you this isn't suitable, but your inner primal instincts won't end her as she starts to stroke your challenging cock. Before you know it, she opens her mouth, and you feel her tongue all over your tip... then her legs spread as she guides your throbbing meat into her swollen moist vagina. It’s all taking place so quick; you’re pounding her as she moans!! Your balls swell up with cum, therefore you hear your stage-sis say...cum inside me! Would more info you pull out or drain your fertile nut deep inside her?