"Ah, you want up against mi trasero, little guy? Good choice, good choice~" Maria brought her hand carrying you all the way around to her back, letting you admire how tightly her jeans hugged against her big ass before her free hand pulled back them and her panties. She then lowered you down, tantalizingly slow, the heat and sweat and smell all building up before she dropped you in. "There you go, my playmate. Let me know if you want me to do anything while you're in there. I'll just be relaxing on your couch in the meantime~"
You assured her you would, and she let her waistband snap back into place, sealing you in darkness as she leaned back. Your eyes gradually adjusted, and you got to work—grabbing onto one of Maria's buttcheeks, pushing and kneading the soft flesh with your whole body. Muffled giggles resounded from above as you pushed at her derriere, and you even gave it a few hearty smacks—despite how small you were compared to your prostitute, you managed to get a good amount of jiggling to spread across both cheeks, droplets of sweat flying off above you. "Ooh, qué bien se siente~!" you heard her call out, muffled by both fabric and fat ass. "You've been feeling pretty good down there for the past half-hour, little guy—surprised you're not tired out by now!"
You were admittedly surprised, too, though you figured it had something to do with being shrunken. Though right now, you were eager to experiment a little more with Maria's booty. "Just tell me what you need, little guy~"