When I returned dawn was just starting to brighten the sky, and I was standing in front of my house and saw Madi walking down the driveway.
"Hey Madi." I called to her and waved my arm.
"L-Lisa? What're you doing back?" She asked, then added, "And where are your clothes?" I looked down at myself and only then did I realise that I was stark naked.
"Come inside and I'll tell you everything." I told her and gestured towards the house.
Once inside I explained the demon, the roses, and my rebirth. She amazed me by sitting there quietly throughout.
"So you're a shape-shifting centaur, who had sex with a demon, who has a massive cock, and demonic roses?" She asked when I was done and took a sip of champagne, which I had poured for us.
"Pretty much yeah." I said and watched her carefully. For several moments neither of us said or did anything, and then:
"HOLY SHIT!" Madi shouted and I couldn't resist grinning as the truth finally set in.
"No way! They said you were ill, that must've been a hallucination." She said trying to rationalize the supernatural explanation I had given her.
"Madi," I said without emotion, and she turned to look at me, "Watch this." With that I felt my lower body transform into my new equine form.
To her credit Madi didn't start screaming immediately. They began about five seconds after I'd revealed my form to her, and man she could scream. I let her since my neighbours were heavy sleepers and would be asleep by now. Once she had calmed down she became curious as to whether or not I had the body of a horse.
"Can I pet you?" She asked and giggled at how silly it sounded. I let her, and was surprised by good it felt to have her soft hands stroking my silky fur. Without meaning to I let out a low moan of pleasure.
"Oooh, that feels good." I felt her hands go beneath my body.
"Oh my god!" She said in shock and excitement.
"What?" I asked annoyed that she had stopped. She didn't answer, instead she reached between my hind legs and gripped my cock. I must've grown without a conscious decision.
She stroked my quickly hardening cock, until it was standing fully erect at seventeen inches long and three inches thick. Her other hand began stroking my massive horse cunt, so large and moist that her hand slipped in with no effort, filling my cunt though not stretching it. I moaned my approval as she began pumping her entire forearm in and out of my cunt, while her small hand stroked my cock with increasing vigour. Not wishing to be the only one receiving this incredible pleasure I added some of my own creations to my equine half. I heard Madi cry in shock, but she didn't stop pumping and stroking, even as octopus like tentacles ripped her clothes off, not that she was wearing much besides a coat, and two suckers latched onto her already rock hard nipples.
Her moans were musical and encouraged me to go further. My skin coloured tentacles stroked every erogenous zone on her body, leaving not an inch of her over sensitive skin free. She responded to my touch by forcing more of her arm into my pussy, now she was pushing her arm in almost to the shoulder, while her other hand glided up and down my cock, now lubricated by my pre-cum. I returned the extra attention by attaching several sucker tentacles to her enlarged clit and sopping wet pussy lips. Her moans increased in intensity and I knew her orgasm was fast approaching, as was mine.
"Ah! Madi, I- I'm cumming!" I wailed.
"Oh my god! Cum, Lisa, cum all over my arm and hand!" That set both of us off and I felt my hot cum racing up my cock and my cunt juices exploded all over Madi, who was screaming that she was cumming.
I hadn't cum with my horse cock before, and was pleasantly surprised by how much cum it produced, quickly covering my horse stomach in white along with created a large puddle on my floor. What's more, it didn't stop! My orgasm lasted longer than when I fucked Credo and the roses, though I hadn't had my cock back then. Madi was also trapped in an endless orgasm and her juices joined my own cum. Thankfully our climaxes ended after nearly five minutes, ending with a near pool of cum. Madi pulled her arm out of my still clenching horse cunt and would've fell back if not for my tentacles holding her up.
"Lisa?" She asked having recovered enough to talk coherently.