A remarkably astute assumption that proves.

"So," Ellie says once they get there, "I thought we could start with a description of some of your..." giggle, "conquests."

"What they looked like or what I did with them?"

"The latter." Blush.

"Though a bit of color commentary on the former wouldn't go amiss..."

She sits on Ellie's bed, humming thoughtfully. "Well, all proper accounts should start at the beginning... My first conquest was when I was fifteen with a boy in my class. A bit tall, a bit lanky, a little bit older than me... Had freckles and glasses and a world of awkwardness. I didn't get up to anything too exciting, though it felt differently at the time..." Smirk. "Given we were outside at the time, and he wasn't very good at staying quiet, I had to gag him."

"The first really exciting bit... I'd been flirting with a very pretty girl - she looked a little like Ellie, actually, thinking back - and she kept taunting me, so as soon as I got her cornered I tied her up with her own scarf. Enchanted so she couldn't break it, of course. I spent a little while taunting her, then - turn about was fair play and all - and got her very worked up until she started begging and apologizing for teasing me. We dated for a little bit until her family moved away - she never really stopped being a brat, and I ended up spanking her once."

"I started getting into experimenting with Transfiguration around then, too - I'd already mastered the Animagus, and wanted to know how far I could push it, on myself and others. Animal features, different body shapes, playing around with sex characteristics... Not always just for play - one person I was dating asked me to Transfigure her into a girl permanently - but mostly reversible." Pause. "There were some awkward visits to the nurse's office when we were all starting with that..." She snorts. "Especially when we got into creativity with other fields - I had to very sheepishly drag a girl there once after we miscalculated a dose for a recreational love potion, and the nurse badgered me into learning Healing if I was going to keep inventing strangulation and pain charms."

"Wow."

"Perhaps I could teach you a few spells... After all, I'm still acting as your professor. There've been some exceptionally creative ones over the years."

"I think that would be an excellent place to start."

"Let's see... Spells for giving someone animal ears, a tentacle-summoning spell, sensory deprivation spells... Sensory heightening spells, those are always fun... A large assortment of ways to limit someone's movement..."

"Start from the top of the list, and we'll work our way down."

Well, the most basic of the animal features spells actually gives someone features from their Animagus form, the exact feature controlled by the last word... There's also ones for features from specific animals, and a strategy for more freeform Transfiguration...

Ellie is gonna give Anathema tiger ears!

She laughs when Ellie manages the spell, wiggling a bit. Her white tiger ears actually contrast very nicely against her hair.

Scritches!

Purr!!!

Seems like this'd be a good one to combine with the sensory enhancement...

Ooo, yeah. 

Does Ellie want to skip to that, then? 

Yep!

Alright! 

So there's a few categories of sensory enhancement - Ellie's likely going for touch, here. You can do it on someone's entire body - the easiest way, usually - but some conquests find that very overwhelming (Fay likes seeing their reactions, but, well). You can also target specific body parts, though those aren't really distinct spells...

Anathema will just have to be the subject of a little practice and experimentation, then.

She gets mentally overwhelmed very easily from this spell, blissing out at the lightest touch.

(There's variants to transform all sensations into pleasure or pain, too, of course...)

Might be fun to mix some of those in, at unexpected times.

She gets Anathema writhing, switching between giggling and shrieking, set off by just the pressure of her clothes, the bed under her.