No doubt her cunt was tight… Much tighter than those of my pervious fuck partners. But it was well lubricated due to prolong foreplay and it helped ...y cock when I pushed it inside her.I looked at my sister; tears wailing in her eyes… Her face grimaced with pain… But it was easing and she was slowly gaining her control.“Its hurting… Ahhh…”“Relax Mansi… Relax…” I gently kissed her on her lips. “Its over… Its completely in… See.”I took her hand and kept it over her cunt… Where my cock was. "B.F. Skinner?" he asks, and I nod. "Sure, we learned about him last summer during that course I took at the university." Sometimes I forget I'm dealing with a genius level IQ. Okay, here goes. I take a deep breath."Okay, so you're familiar with cause and effect and stimulus and response?" I ask."Sure, but Aunt Sara, we already know what the cause and effect is... I don't see..." I cut him off before he can continue."Wait," I assert, and he just sighs. "There has been some success with a. We were both masturbating naked in front of windows that looked out over the whole campus. I pulled her wet hand away from her pussy and began sucking on it, while feeding her my own wet fingers. I love the taste of a woman’s excitement. Finally Sophie giggled and pulled away. “OK, girl, let’s be REALLY wicked.” Sophie had a wild glint in her eye. Lightly playing with my wet pussy again, I grinned. “I love wicked.” “OK, let’s get our clothes on again, for starters.” Wondering what she had in. She was sensitive and her hole seemed to want to be open. Engorged and pushed out from the inside. She left her bed and toweled her crotch. Pressing the towel to her hole, she ran into the hallway and hesitated at Yenna’s bedroom door. After a long moment, she knocked.“Yenna?”Roused from her sleep, Yenna took a moment to answer. Mira entered the room, still pressing the towel between her wet, inner thighs. She took a few steps toward the older girl, still sleepy eyed on her.