"I think I'm a little prettier than that," Rias purred with a deep, throaty laugh that he swore he felt in his cock.
"Rias, I'm not going to last with you doing that," Harry groaned.
"I'm pretty confident I could get you hard again, but I guess you don't want to cover yourself in your own cum," Rias said, smirking. Tracing her nails up along his abdomen, she said, "you're rather cute, you know. You're handsome with a pair of seriously gorgeous eyes, and you've got some pretty nice definition here and on your arms. With some training, I think you could end up being a total hunk."
"You're the most beautiful woman I've ever laid eyes on," Harry said earnestly. "Even the paintings of other devils in that book don't compare."
"Paintings?" Rias asked.
"The book I borrowed, the one that explained how to summon devils, contained a few animated paintings of the ones the author had summoned," Harry said.
"I'd like to see it sometime," Rias said, "but we have better things to do right now. I'm wetter than I was, but I still don't feel confident enough to try and take this monster cock of yours."
Harry felt a surge of pride at how she complimented his cock and said, "I wasn't done."
Flipping them back over, he returned to worshiping her breasts when he noticed something that he hadn't before. A scent, something that he hadn't smelled before and yet made his cock throb even harder, was coming from Rias. Realizing that it was coming form lower down, he started planting a trail of hot kisses down her flat abdomen until he reached her sex, getting his first view of a woman's pussy.
Rias was entirely hairless between her legs, so Harry could see all of her mound, including her rather fleshy nether lips. That intoxicating scent he had smelled before was coming from her pussy, he realized, and it was making his mouth water.
"Taste me," Rias sighed. "Please."
She didn't have to tell him twice, and he was rewarded with a loud, lewd moan from the crimson-haired beauty when he gave her a long lick from bottom to top. He moaned at the taste, finding her delectable, and immediately began feasting on her. She gripped his black locks again, her nails teasing his scalp as she enjoyed his ministrations. Her thighs clamped around his head, and Harry looked up to see her looking utterly blissful.
"So enthusiastic!" Rias giggled, sounding pleased.
"You taste so good," Harry said, pausing from what he was doing only long enough to get those words out.
With his eyes locked on her face, he was able to see her breasts jiggle as she laughed at the compliment and groaned.
"You're not bad for a first-timer," Rias said. "You see that little nub at the top? The one that looks like it's being mostly covered by a hood."
"Mmhmm," Harry replied.
"That's my clit," Rias said. "Try swirling your tongue all around it without touching it directly yet."
When he did as she asked, she cried out in pleasure, and her grip on his head tightened.
"Oh, fuck!" Rias moaned. "Just like that."
Despite what Snape thought, Harry was capable of following instructions, particularly when they were simple and came from someone as alluring as Rias Gremory. He continued to eat her out, paying close attention to what she liked most. He didn't spend all of his time on her clit, trying to see what else really worked, and before long she was moaning in pleasure pretty constantly.
"You've got a gift," Rias said after a while. "It was obvious this was your first time when you started, but now...oh fuck...now you're doing as well as Akeno."
"Who?" Harry asked, taking a short break.
"My best friend," Rias replied. "You'll meet her after you've become a part of my peerage."
"Her?" Harry asked, feeling his cock throb at the thought of Rias having sex with another girl.
"You like that?" Rias asked, looking amused. "Maybe if you're really good, I'll let you watch us."
"Fuck!" Harry groaned, making her laugh.
"Just this morning, I had her tied to my bed and was torturing her with a vibrator," Rias purred. "I denied her her orgasm over and over again until she was begging me."
"What's a vibrator?" Harry asked.
"You really are sheltered, huh?" Rias asked. "It's a human sex toy that, as the name would suggest, vibrates. It feels wonderful when pressed against my pussy."
That gave Harry an idea. He did, after all, know something that could vibrate, though he wasn't sure if he could force himself to speak parseltongue. Going back down on Rias, he flicked his tongue back and forth across her clit while picturing a snake in his mind.
"Testing," he said to himself.
"Huh?" Rias asked.
Ignoring her, he focused a little more intensely on the image and said, "testing."
"FUCK!" Rias shrieked at the top of her lungs, her thick thighs clamping down hard around his head as pleasure assaulted her senses.
Harry continued speaking the language of the snakes directly into her overflowing pussy, keeping his eyes on her face so he could watch her reaction. Rias went from looking shocked and confused to overwhelmed and ecstatic as she soared towards her orgasm. Her body started to shake as the pressure grew more and more intense, and as it finally broke, her back arched off the bed, and she squealed so loudly that Harry was glad her thighs were pressed against his ears.
"AAHHH!" Rias screamed after taking a breath, the waves of soul-searing pleasure continuing to wrack her entire body.
Her juices gushed from her cunt, and Harry worked to drink down as much of her nectar as he could, moving down to her overflowing opening. He pushed his long tongue, which he had always felt was rather freakish as a child, as far inside her as it could, tasting her even more deeply. He continued making it vibrate within her, and as it happened to brush against a rough little patch inside her, Rias' reaction was immediate.