Prostate massage and threesome with stepsister

His girlfriend doesn’t have much idea about how to give him a good prostate massage, the chick is really hot, but she doesn’t even stick her tongue up her ass, that’s just the way it is. Fortunately, her step-sister, who is very liberal, has offered to have a threesome with them and teach the girlfriend how to stimulate her guy’s prostate properly. Besides, the truth is that she has to confess that she’s been wanting to try her stepbrother’s cock for a while, so here’s an opportunity not to be missed.