He remembered the time when he accidentally saw his sister's panty drawer, and how all of them had a hole at the bottom. "You know what. She wanted to tell mom? Why not get her back..."
He unplugged the chronivac's emitter, and took it with him, knowing he can use it for some changes on the fly. "Just in case I wanted to do something, I can."
He knew he was going to attempt to be sneaky anyways, and decided to take his clothes off now, so he can feel everything when he gets in. "I guess this is a bit more reason to stay out of sight, anyways."
Placing his clothes in a pile on the bed, he slips the door open, peeking out. "Nobody there..." Seeing the hallway empty, he went out on the hunt for Mary.
He went to her room quickly, and as expected, she was there. She was laying on the floor, drawing with a pack of crayons, her legs swinging back and forth in the air. He snuck in quietly, trying to make sure she doesn't hear him.
Once he got close enough, he got down on the floor, and crawled forwards. His penis dragged on her rug as he closed in, getting under her skirt, and seeing the patterned panties so nicely revealing her intimate areas. Knowing she'd already have felt him, he pressed his hands down on her thighs, and pushed forwards, his head entering her tight pussy.
She screamed as he entered, but he pushed on. Once he got his upper torso in, he used his legs instead, and felt her trying to get him out. She pushed herself up into a sitting position, which forced a bit more of him in than he was intending, and he went faster as she tried to reach in and feel what was up.
He felt his legs breach the opening, her soft labia remaining shut once more. He crawled a bit further in, and heard faint crying on the outside, muffled due to his location. He decided to stop just outside the cervix, not wanting to go in the womb just yet. "That could've been bad if she caught me."