Does one pull out or drain your fertile nut deep

Okay...so you couldn't resist the urge to view your move-sis bare. It begins off as playful sexual stress, 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 won't cease her as she starts to stroke your really hard cock. Before you realize it, she opens her mouth, and you're feeling her tongue all over your idea... then her legs distribute more info as she guides your throbbing meat into her swollen soaked vagina. It’s all happening so quickly; you’re pounding her as she moans!! Your balls swell up with cum, therefore you listen to your phase-sis say...cum within me! Would you pull out or drain your fertile nut deep within her?