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With the stretch of Adelaide\'s buttocks, her vagina was also slightly spread open, enticing Erwin\'s gaze. He delicately slid his finger under her panty, moving it away from both of her inviting holes. As he positioned the smooth head of the buttplug against Adelaide\'s anus, it became clear to her what the purpose of the buttplug was.

Positioning the smooth, pointed part of the buttplug against her anus, Erwin applied some pressure, gradually pushing it inside. As it fully entered her anus, Adelaide experienced a sensation that made it momentarily difficult to catch her breath. Yet, amidst the slight breathlessness, she found immense pleasure in the feeling of fullness and the tantalizing restriction caused by the plug, heightening her arousal.

Erwin, with a tone of surprise, asked, "Do you also started to play with your anus my naughty pet?" He was amazed at how effortlessly the plug entered her anus, despite its considerable size, comparable to that of a gold ball.

Adelaide blushed upon hearing Erwin\'s question, her own surprise mirroring his. She couldn\'t deny that the smooth insertion of the buttplug was a direct result of her regular indulgence in self-pleasure. Sometimes, while engaging in masturbation, she would explore anal stimulation to intensify her sensations and attempt to achieve orgasm. Though she had not yet reached that climax, she noticed her anus gradually stretching and becoming more relaxed over time.

Observing Adelaide\'s silence, Erwin simply smiled and asked, "Shall we fulfill your wish now?"

In response, Adelaide sensually guided her hips downwards, aligning her vagina precisely with Erwin\'s throbbing erection. Erwin, taking a passive role, gently assisted her in finding the perfect position, ensuring that the penetration would be as smooth as the buttplug. From that point onward, he left everything in Adelaide\'s capable hands, allowing her to fulfill her desires at her own pace and in her own way.

Adelaide\'s thoughts raced as she lowered her hips, anticipating the moment of penetration. \'His penis is so much larger than my finger... no wonder I struggle to orgasm on my own,\' she pondered. With each inch of Erwin\'s thick shaft entering her, she could feel her vaginal walls stretch and brush against every sensitive inch of her tantalized skin, igniting a powerful mix of pleasure and sensation.

Her vaginal walls stretched to their limits as she used her hands to hold the curvy skin, creating a wider entrance for Erwin\'s eagerly awaited presence inside her warm and moist sanctuary. Simultaneously, her anus stretched, revealing the shimmering surface of the butt plug nestled within. As she began to accommodate the full length of Erwin\'s shaft, she reveled in the intense sensations that engulfed her.

"This is it... Yes, so hot, so hard... It\'s making my body burn with desire," Adelaide thought, her mind fixated on the singular goal of achieving orgasm, knowing that only the possessor of this throbbing member could grant her that pleasure.

Erwin, displeased with the slow pace of penetration, took hold of Adelaide\'s hips and exerted force, forcefully driving his erect penis deep inside her.

"Ahhhhh..." Adelaide moaned as the full length of Erwin\'s sizeable shaft suddenly impaled her, penetrating her cervix and stretching it to its limits. Ecstasy flooded her senses as pleasure and sensations overwhelmed her mind. Her eyes rolled back in bliss as her body tensed, her curled toes indicating the intensity of her physical response, as if trying to contain an explosion within.

"What the fuck? She\'s so tight!" Erwin exclaimed, feeling the intense grip of Adelaide\'s vaginal walls constricting around his penis. Overwhelmed by the sensation, Erwin tightly embraced Adelaide\'s curvaceous body, thrusting his member deeper, hoping to overpower her resistance.

"Ahhhhh... Don\'t..." Adelaide protested, but luck was not on Erwin\'s side. The explosion of pleasure Adelaide had been holding back erupted, causing her vagina to clamp down tightly on Erwin\'s penis as the head fully penetrated her cervix, triggering a powerful orgasm.

As the climax took hold of Adelaide, her vaginal muscles squeezed Erwin\'s penis with an even tighter grip. The warmth of her pleasure surged through her body, and she couldn\'t contain the surge of fluids that accompanied her release. Her wetness coated Erwin\'s pants and thighs, a visible testament to her arousal.

Feeling the pulsating contractions of her vagina around his member, Erwin surrendered to the intoxicating pleasure. "I can\'t hold back any longer," he moaned, his voice strained with anticipation.

Feeling the pulsating contractions of her vagina around his member, Erwin lost control and released his semen deep into her warm, welcoming depths, shooting directly into her cervix.

Adelaide\'s sweaty body tingled as a cold wind brushed against her skin, creating a stark contrast to the scorching sensation of the liquid filling her vagina. The intense heat seemed to dissolve her sense of reason, leaving her consumed by pure desire.

Her naked form shivered with pleasure and vulnerability, her legs trembling beneath her as she found herself fully seated on Erwin, his throbbing member still buried deep inside her. Erwin, lost in the moment, tightened his grip around her, his face pressed against her back and his hands possessively encircling her stomach, ensuring she remained firmly connected to him.

Adelaide gasped, her voice a mixture of pleasure and surrender. "Oh, God... I can\'t believe how good it feels. Don\'t let go," she pleaded, her words filled with a desperate longing for more.

Erwin, driven by his own desires, responded with a husky whisper against her skin. "How can I let it go when your hungry vagina is trying to squeeze every last drop out of me?" he growled possessively, his voice laced with a primal intensity.

And continued, "It\'s like a greedy little mouth, hungrily devouring my throbbing cock," he taunted, his voice filled with a mixture of arousal and dominance.

Adelaide, though initially taken aback by Erwin\'s disrespectful words, found herself inexplicably drawn to the intensity of the moment. Her own desires swirled within her, fueling a response. With a hint of defiance in her voice, she retorted, "Well, maybe my hungry little mouth isn\'t satisfied yet. Maybe it wants more of you. Are you man enough to give it what it craves?"

\'So, she wants to have another round,\' Erwin thought to himself, a smirk playing on his lips as he noticed the mixture of fear and anticipation in Adelaide\'s eyes. It wasn\'t a fear of harm, but rather the fear that he would decline her challenge. She desired another encounter but couldn\'t bring herself to ask directly, so she issued a provocative challenge instead.

Erwin, well aware of Adelaide\'s schemes, decided to play along, reveling in the power dynamics between them. He opened his mouth to taunt and accept her challenge, but just as he did, their attention was drawn to a voice in the distance.

"Is this where we\'re going to train in spell casting?" an excited voice echoed through the air.

Erwin glanced at Adelaide, expecting to see a look of fear or disappointment on her face. However, to his surprise, her expression was one of mischievous delight. Her vaginal walls tightened around his penis once again, fueling his perception of her as a wanton seductress. He couldn\'t help but mutter, \'What a slut,\' observing her professor\'s perverse behavior.

While Erwin yearned to prove his prowess as a man, he also weighed the consequences of being known as a student who had engaged in a sexual relationship with his professor. Such a reputation could undermine his future prospects and make potential targets wary of him. With that in mind, he made the decision to bring this session to an end.

******

"I want to do it once more," Adelaide said with a sense of sadness and unsatisfied desire evident on her face as she walked alongside Erwin toward the library.

Aware of approaching students, Erwin swiftly urged Adelaide to dress herself. However, her torn, tight leather attire posed a challenge as it resisted being stripped off and replaced. In an attempt to address the situation, Erwin selected a long white skirt that matched her white shirt.

Adelaide, displaying her stubborn nature, caused a bit of a commotion as she resisted wearing the skirt, expressing her desire to continue their session. However, Erwin remained resolute, understanding the need to maintain his reputation within the academy.

But upon seeing the unsatisfied expression on his slave\'s face, Erwin\'s desire to continue engaging in sexual activity intensified. He didn\'t want to appear easily swayed or manipulated, so he pondered how he could provide her with more pleasure while still maintaining a sense of control. It needed to be a reward for her, a way to satisfy her desires.

In this way, she would come to understand that her pleasure was dependent on satisfying her master\'s desires. With each encounter, she would strive to please him, forming a deep dependence on him for her own satisfaction.

In that moment, Erwin\'s gaze fell upon Valara approaching them. With a mischievous glint in his eyes, he reached out and firmly squeezed Adelaide\'s voluptuous buttocks. She could feel the pressure on the buttplug inside her, causing her anus to stretch ever so slightly. Erwin, his voice filled with a mix of dominance and temptation, proposed a daring proposition to his professor.

He suggested, "How about this, professor? You\'ll proudly display this buttplug protruding from your anus in front of Valara while we engage in conversation. And in return, I\'ll fulfill your deepest desires?"

Adelaide\'s mind raced as her gaze locked onto Valara, approaching them from the direction of the library. The presence of the buttplug inside her anus reminded her of Erwin\'s proposition. She had performed such acts before, but always in the privacy of their encounters. The thought of doing it in front of Valara, her assistant, filled her with a mix of embarrassment and anticipation. Deep down, she craved an intense session with Erwin.

Her eyes met Erwin\'s, and with determination, Adelaide spoke up. "I\'m willing to do it, but only if you promise to indulge me for an entire day," she challenged.

Erwin\'s lips curled into a mischievous smile as he replied, his voice laced with playful mockery. "Hahaha, sure, sure. But can you handle it, my dear?"

Adelaide\'s mind was immediately flooded with vivid images of Erwin\'s sizable member destroying her eager holes as she heard his words. A surge of determination coursed through her, reflecting in her resolute expression. Without hesitation, she responded, her voice carrying a confident tone. "I can."