A Succubus by Any Other Name (Patreon)

 Some establishing details for Ambri, since she's new.

When using her powers, her eyes glow, turn pink, and her pupils become heart-shaped.
Normally submissive in nature, she can get carried away with certain, unique individuals, typically folks with unusual or overly sexualized bodies. Kassia, here, fits that bill quite well, with three rows of breasts, three cocks, and three testicles.
Her powers and energy are replenished with her partners' sexual fluids. Thus, its better for Ambri if she can make her partner cum if she's using her magic in the act. Otherwise, she grows quite sluggish and tired. It also holds true that the more cum she harvests, the more rejuvenated she is afterwards.

In this scene, Ambri - shortly after becoming a succubus - is having sex with her close friend, Kassia. In the process, Ambri gets carried away and begins swelling Kassia's breasts, cocks, and especially her balls, all while Ambri rides Kassia's middle cock and her tail hands service the other two. Kassia melts under the sensations and surrenders her seed, which swells Ambri's small belly with plenty of material for her to quickly convert into more magic.

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Just taking a quick break to do this before continuing with Marri's Downfall! I'll be back with the next part of that very soon!