Not even a minute

Melissa closes her eyes and holds her breath for a long time. Finally it appears that she has made her decision and with tears flowing from her eyes she slowly pushes down onto the two demonic cocks. "I hate you..." she manages to say but the lust in her voice is unmistakeable. You merely grin at her and enjoy your cock sliding in and out of her tight cunt as she damns herself for all eternity. "I... I... MmmhPh -sooo fucking big!" You and the hellhound laugh as you hear her succumb to lust and with that you stop teasing. You grab her hips and start to pound her pussy without mercy.

The Hellhound pushes deeper into the transforming teenager's ass making Melissa scream and grab hold of you. She wraps her arms around your shoulders and whimpers before she gets used to the massive cock nearly splitting her, your cock pushing all the way into her womb with each plunge doesn't make that any easier. ...Luckily for the harlot the corruption changing her body prevents any permanent damage and soon Melissa is howling from lust, not pain once again. "See, I knew you'd like this, why I bet you feel ..Mmm... Foolish for even trying to resist?" You can't help but feel smug. Melissa is beyond caring and she just continues riding the twin cocks. Since you can't tease her anymore you instead raise your tail to her mouth and she obediently sucks it.

All three of you orgasm at the same time, with all her holes being filled with demonic cum Melissa shakes as multiple orgasms rock her, her screams muffled by your tail. The transformation is quick and deep crimson colour spreads to cover her skin and her body begins to change into the now familiar demonic perfection that all succubi have. You and the Hellhound pull out, not a drop of your cum leaking, to let her rest on the ground as her tail and wings emerge. The newborn succubus lazily stretches before opening her glowing yellow eyes and looks around, as her eyes focus she first sees her, now crimson coloured, hands but if she once had any regrets about losing her soul these are quickly over as she begins to caress her massive breasts and she can't help but shiver when she touches her sensitive clit. You don't let her enjoy this for long. "Arise newborn, we have still more work to do and cocks for you to drain as we spread this gift of ours." She gets up willingly, taking a scornful look at her former friend, turned into beastly demon. "Thank you for this gift master, I may lay down with beasts like him... But I prefer this body."