Excellent art! Good character designs and facial expressions. Love the visible bulges. A few of the character poses used at the moment are a little too dynamic to be their default one. They feel more like something the character would use on occasion to emphasize their dialogue.
The background is beautifully rendered and detailed. The music selection fits the mood.
The dialogue is a little too horny. I feel like the flirting needs to be paced and ramp up somewhat instead of just jumping straight to throbbing cocks and dripping pussies. You got to tease a little. Maybe the protagonist is a little scared and apprehensive about the encounter? Maybe the demon didn't fully want to be summoned or doesn't like her new body? Some drama would go a long way in heightening the narrative engagement.
Good luck with the project! The story hook is interesting and I think the plot's got a lot of potential if it gets a little extra spice.