"How you doing down there Adam?" Hugh asked the woman currently sucking his dick.
"Mmhh... SCHLORP I'm doing all right." Adam looked up at Hugh, who was clearly a bit uncomfortable, "You don't have to act like you're not enjoying this. The magic - that spell - well I'm pretty sure it's making me enjoy this." Adam shrugged and went back to suckling on Hugh's dong.
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The spellbook Adam found at the library had a cantrip that promised it would make "the ultimate lover", and had tried it without giving it a second thought. Hugh had been in the room at the time, and they were both pretty shocked when Adam transformed into a small-titted woman. Hugh was a little suspicious that Adam had actually been trying to transform HIM into a woman, but Adam said he thought the spell was supposed to turn him into some kind of hell hung hunk. Hugh started looking through the spellbook more carefully and realized it had a bizarre organizational structure. The complete spell descriptions weren't on the same pages as the spells themselves. The spell Adam had cast was supposed to turn him into "the ultimate lover" of the closest other person, which was Hugh.
Adam belittled Hugh his mundane choice in looks for a lover and Hugh said nothing. He looked through the book further and found another spell that was supposed to turn the caster into a man. Adam tried to cast that spell, but nothing happened. A bit more research revealed the fuel of all the magic in the book was cum. Cum in the body, specifically. Adam's own balls had provided the energy to turn him into a woman, and now that he didn't have them anymore, he was helpless to cast a spell.
Unless...
------
Hugh closed his eyes and gasped. It was a bit tricky getting over the fact that the woman blowing him was in fact his buddy and roommate Adam. And also, despite what the spell said, she wasn't really his type. She was hot, obviously, but not really like his "ultimate lover" or anything. Nevertheless, Hugh was a guy and he was getting his dick sucked, and not a lot else really mattered.
"Oh shit, I'm gonna-" Hugh tried to give some warning so as to not take Adam by surprise. After all, this was Adam's first blowjob.
Adam braced himself, ignoring the fact that Hugh's grunts and moans were turning him on, this his nipples were hard and his pussy was wet and that he'd actually LIKED sucking his friend's dick. It was the magic, obviously, he was sure. Hugh's "ultimate lover" liked sucking dick. He tried to angle himself and Hugh's dick so that it would hit his tongue and not the back of his throat.
"AH!" Hugh groaned and his salty spunk flooded into Adam's mouth. Adam began swallowing immediately.
And immediately, Adam's body started to tingle. He thought, briefly, for a moment, that maybe the spell he'd cast to turn back into a man had hung latently on him, waiting for fuel. But instead of growing bigger or feeling his dick regrow, Adam felt... smaller. Hugh's cock tried to pull away from him as Adam shrank several more inches, and he had to lift himself up in his squat to keep from it slipping out of his mouth. The tingling around his breasts was intense a new, drooping weight there. His hair was different too, and his skin, and his face, and then it passed.
Adam stayed there, croutched, his mouth still on Hugh's cock sucking greedily. He wasn't about to let a single drop go to waste, was he?
Adam looked down and gasped, socked to see the woman sucking his cock had changed. She was a busty East Asian woman now. Seeing her there, with her mouth on his dick, Adam felt a sudden incredible thrill. He had a thing for busty East Asian chicks.
Adam gasped when he finally let Hugh's cock slip from his mouth and realized not only was he still a woman, but he was if anything MORE womanly, and also a new race.
"Oh man." Hugh groaned as he realized what had happened, and explained, the original spell to turn Adam into his "ultimate lover" had run out of fuel. When Adam had swallowed Hugh's cum, the spell had finished. NOW Adam was Hugh's ultimate lover.
"Well then that means I just need to get more cum!" Adam cried hopefully in a new, sultry voice. "I already cast the spell to turn me back into a man, so it's just waiting for some jizz to get going!" Adam pounced back on his friend's dick and resumed sucking with even more gusto than before.
Hugh wasn't about to deny the beauty her meal. Only...
Only as Adam sucked, he started to get distracted. Cock was yummy(?) but his pussy was fucking aching for some attention. And cum inside him was cum inside him, so why limit himself to sucking dick? Why not find out if his pussy was going to feel as incredible as he thought it would?
Adam pushed Hugh to the ground and jumped on top of him. Hugh's cock penetrated Adam and he moaned. The sensation far surpasing anything he'd felt as a man as he began bouncing on Hugh's dick like his life depended on it.
They fucked and Adam mewled and Adam came once, twice, three times... Hugh, even though he'd jusy cum, couldn't take it anymore and soon his balls emptied in Adam.
Adam collapsed backwards, spend and exhausted and satisfied - his whole body tingling.
Only it wasn't magic tingling. Adam did not transform at all. He just tingled with the glow of a woman well-fucked.
When Hugh pointed out Adam wasn't turning back, Adam made a hasty excuse it was because Hugh's cum was leaking out of his pussy. Clearly he just needed more still.
The truth would eventually come out after a few weeks worth of many more rounds of fucking with ever increasingly lame excuses about why they were fucking. The magic only lingered after it had started. That meant since the spell to turn Adam back into a man hadn't actually gotten started, it had just dissipated and done nothing. With this revelation, Adam (reluctantly, for he had come to really enjoy sex as a woman) cast the spell to turn back into a man again (after more fucking, obviously) only for nothing to happen.
That was when they discovered that the "turn into a man" spell wouldn't work on a woman if she was pregnant.
Adam - or Adi as she was then going by - was actually happy to learn that she'd be stuck that way. After all, Hugh's ultimate lover was one who he loved and who loved him and who came like gangbusters on his cock. That sounded like a pretty sweet life to Adi.