Muriel felt George's thumb trace over her lip, felt his still-damp fingers catch against the ends of her hair, and Merlin, she loved this. She turned her head and pressed open-mouthed kisses against the side of George's cock, and she loved this. Giving oral sex. It wasn't something she would have admitted to anyone - perhaps even herself - when she was younger, but she did. She loved the closeness of the contact, the decadent nature of it, the smell and taste of him. And she supposed she wouldn't be any kind of Slytherin if she didn't enjoy the power, the juxtaposition of it - on her knees for his pleasure, but with him entirely at her whim.
She followed the kisses with her tongue, licking him, slipping her hand up and down to spread the wet with firm strokes. He wasn't hard yet, but that was all right. She would enjoy the feel of him stiffening under her hands, against her tongue.
Muriel lifted his cock and tongued along the underside, then slipped lower and sucked first one, then the other of his balls into her mouth, letting a murmur rumble up onto her tongue. She watched him as she did it, catching his eyes, and felt the corners of her mouth twitch up in a smile.