Un professeur roux explique la science de la prise de but

The science in every but plug ever inserted in a female asshole is very tricky, it starts with the lube that is needed to grilse up the plug she is inserting so it fits easily into her amazingly tight asshole and allowing it to make it pop when needed by simple contracting of her butt muscles, while she gently fits a dildo inside her pussy and occasionally her slim fingers and even hand.