Harry did as he was told, applying a tight seal around the thick cock that was stretching his jaw as far as it could go. He slowly started tracing his tongue around the swollen, hot tip while sucking on it, coaxing even more of the clear fluid out of the pulsing monster.
"Mmm," Lily moaned, "excellent, you are learning quickly!" She praised, brushing her fingers through his tangled locks.
"Now keep doing that, but start slowly pumping your head so that your lips glide over the tip. Don't let it leave your mouth at any point, though!" She warned.
Lilly gasped as she watched him obey, clinging to her every word. She groaned in pleasure; looking down into those obedient green eyes was almost pushing her over the edge. She took a deep breath to steady herself, wanting to get it all right now; she would have plenty of time to ask for a repeat performance.
"G-good," she gasped. "Now include your hands. One of them to pump my shaft as I did earlier, and the other to rub my testicles."
Harry obeyed, marvelling at how hard her erection felt in his hand before cupping her massive balls, unable to hold more than one at a time, practically feeling them churning with her cream.
"Oh!" Lily moaned, making him feel proud of himself, eagerly pumping his head over the sensitive tip, lavishing it with his tongue, and having to swallow even more of her sweat essence.
"So good," she praised, "you're a natural at this. You're going to make girls at Hogwarts s-so happy!" She groaned, starting to shove her fat babymaker ever deeper into his mouth.
He gagged as it hit the back of his throat repeatedly, but watching the controlled woman come completely undone was very satisfying to him. Harry had no idea he could do such a thing to a woman, but he knew that he liked it.
"I'm about to come!" Lily warned, moaning every time her cock bumped into his throat.
"Get ready to swallow it, honey!" She shouted, ramming her cock as deep as it would go before letting loose a thick, hot jet of cum right down his throat.
Harry almost choked before quickly swallowing the thick spunk, the next volley already filling his mouth with the musky taste. He swallowed again, feeling her hot nut butter glide down his throat before settling heavily in his stomach. He had no idea how long women could come, but was amazed at how much Lily was feeding him. His tongue kept teasing the underside of her tip while the woman grasped his hair in an almost painfully tight grip, pumping more and more of her hot cum into his willing mouth. He could see the way her hips twitched as she completely unloaded in him, painting his insides white.
He had no idea how long he had kept swallowing until he finally felt her grip relax, and the insistent volleys of spunk slowed down to a steady dribble that he dutifully sucked out and added to the collection. Lily shuddered as she looked down at his sucking and licking mouth, a wide smile on her face as she felt the last of her cream being extracted.
She slowly dragged her spent cock out, biting her lip as she watched the way his suckling mouth followed it.
"Good," she gasped, "so good."
"I'll be adding this to our lesson plan so that you get the chance to practice it and improve before Hogwarts. Twice a week should be good, yes?"
He nodded, not minding doing that again. Making someone feel that good felt really nice; he was in favour of getting better at it.
"Now that the blowjob is taken care off. The next thing on the agenda is fingering, cunnilingus, and analingus. We will cover this for the entire year." Lily says to Harry, to which he nods in acknowledgement.
"Well! That's it for today, sweetie. We will continue the rest next week." saying that Lily cups his face with her hands and gives him a deep French kiss. They continue kissing each other passionately for 5 minutes. After that, both of them took a quick shower and got out of the bathroom.
They did this routinely for an entire year. With Lily training him once every week for an entire year, Harry got good at pleasuring women.