Does one pull out or drain your fertile nut deep

Alright...so you couldn't resist the urge to discover your stage-sis bare. It starts off off as playful sexual tension, but then as her dresses start to arrive off... it will get very actual! Your Mind is telling you this is not right, but your inner primal instincts will never cease her as she starts to stroke your really hard cock. Before you know it, she opens her mouth, and you're feeling her tongue all over your idea... then her legs distribute as she guides your throbbing meat into her swollen soaked vagina. It’s here all happening so quick; you’re pounding her as she moans!! Your balls swell up with cum, so you listen to your action-sis say...cum inside of me! Would you pull out or drain your fertile nut deep within her?