Shrugging the insatiable Iseria said "Fine, I'm going to fuck you senseless either way and this way is more fun for me." laughing as a particularly brutal thrust pounded into the student's gushing depths. Feeling quite horny Iseria touched the massive dildo once more, this time forming a vibrating orb that resided inside the monsterous member which caused a strong vibrating sensation in both of their dripping depths.

Mercy called out a half-formed french curse as the vibration rumbled down into her depths. The sudden shock caused her to clench her hands, holding on tighter to Iseria's shoulder, the other hand reaching around to grasp at the Succubus's round rear end, groping at the expanses of flesh there.

Deep down, Mercy fully believed that this demon woman wouldn't be satisfied until she'd truly fucked the french girls tight ass.

As Mercy grabbed her firm rear Iseria grabbed Mercy's own rear pulling her down onto the monsterous vibrating dildo fucking the both of them. "Haha you love getting fucked don't you girl." she laughed as the cock explored their twitching depths.

"I-... I DO!" Mercy cried out, shoving her hips hard into Iseria's own, bouncing off and back to her, ramming the hard dildo further into her depths. Her breathing was becoming more and more labored, more cries of pleasure escaping her as the succubus fucked her senseless. Her hand closed, squeezing the woman's fleshy ass cheek, groping it and loving the feeling. Mercy leaned forwards, closing her lips around Iseria's breast and suckling on one of her nipples, biting down gently.

"Aaaah, Such a horny girl." Iseria moaned as Mercy began sucking on her sensitive breasts. Each brutal thrust felt even better for both of them as Mercy rammed her hips down onto the invading monster which pushed the other end of the dildo into her hungry cunt.

Mercy opened her mouth wider, trying to fit as much of Iseria's gigantic breast ito her mouth as possible, sucking on the soft orb and grazing her teeth gently against the skin. She moaned as she suckled like a hungry baby, all the while rocking her hips back and forth, trying to get more and more of that dildo into her, she wanted to take it to the extreme.

"Aaaah" Iseria moaned as Mercy suckled on her gigantic breasts while slamming her hips up against the dildo, impaling herself while also pushing the monster deeper inside Iseria's demonic folds.

Quickly brushing against her g-spot, the monster dildo was beginning to drive Mercy towards yet another orgasm, threatening to drain every last ounce of energy that the girl had. She gave a cry muffled by the huge breast in her mouth, Her pussy contracted itself around the item weakly, even the reflexive actions of her climax had been drained off their strength, and she lay back, unmoving save for the rise and fall of her bountiful bosom.

Her fluids leaked from around the dildo lodged within her, and Mercy couldn't even sit up to see.

Seeing the girl is too tired to move Iseria thrusted one last time reaching an orgasm herself. "Aaaah You were a good fuck." she moaned as she removed her half of the beastly dildo from her demonic folds then working her power on the vibrating member inside Mercy, moving the vibrating orb held inside it into the piece deep inside Mercy then splitting the two pieces, the now single sided vibrating monster lodged in Mercy's cunt. "I will leave that inside you to remember me by. Have fun getting it out." she laughed evilly walking away up the stairs to the exit of the basement.

At some point in the future, Mercy would perhaps be able to pull herself to her feet and remove the vibrating length from her depths. For now, however, the Succubus's efforts had taken their toll on the french girls body. She lay in the same spot, covered in sweat and juices from both herself and the demon woman, breathing heavily, occasionally whimpering as the vibrating dildo found a particularly sensitive area.

Mercy turned her head and watched her rapist walk away, trying to follow her out with her eyes. All too quickly though, her body began to demand rest, and she found herself slipping into sleep...