Ruby moans as your head spreads her pucker. Your vision is shrouded in darkness. You reach your hands up and grab her massive ass, thinking of wether you should try to pull out, or push yourself in. Ruby decides for you, and clenches her anus, drawing you in another few inches. You decide to go along with it, and relax. She clenches her anus again, pulling in your shoulders, and then pulling you in up to your sternum. Ruby pants, and whinnies in pleasure. Her clenching pulls you in, further and further, until she reaches your crotch. Now, this scenario had aroused you greatly. And when her pucker stretches around your body, its soft, warm tightness causes you enormous pleasure. You start thrusting, as much as you can, grinding your dick against her pucker. She clenches her anus again, and sucks you up to your thighs. The felling of your cock sliding across the slick, warm, tight, soft interior of her body causes your pleasure to skyrocket. Your thrusting and grinding speeds up, become more and more frenzied. She clenches again, bringing you to your calves, and the feeling of sliding in deeper, and of her sexy insides sliding across your body, especially your cock, causes you to cum. You relax as your cock pumps its semen all over her insides. And with the next clench, Ruby pulls your feet inside, orgasming as she does.