My step-aunt couldn’t stop talking about the “small penis gene.” She wanted to measure me to see if it hit me too. I let her… and even soft, I was longer than her husband is hard. She looked at me like she couldn’t believe it, then smiled and said, “Now let’s see you hard.” She slid her hand around me, slow and teasing, her thumb rubbing my tip until I started dripping. I could feel myself swelling against her palm—thicker, harder, so big she needed both hands to stroke me. She kept moaning about how she’s never felt a cock this big before… and fuck, that had me leaking nonstop. I was throbbing in her grip when she begged, “Cum for me… all over my tits.” She pulled them out - round, soft, perfect - and I lost it. Hot ropes of my cum splattered across her chest, dripping between her tits while she just smiled and rubbed it in