I would probably, currently, rank the Kings of Italy series (all of which are basically 5/5 for me, with some negligible "maybe this is a 4.5-4.75" stuff due to quibbles) as follows:

Mafia Madman--an all time favorite for me. I just can't resist a villain romance, and I think that what makes this work for me a LOT is Gia really standing up as a heroine in a super strong, unafraid to be "problematic" way; which makes her a perfect match for Enzo, and makes Enzo a perfect match for her. What gets me with them is that you get the sense that they're both two of the smartest people in the room (even when they're dumb, which is usually about each other) and would be bored with anyone else. Also, the scene where she bites him hard enough to draw blood and he's like "THIS IS THE ONE" lmao.

Mafia Target--probably the most swoonily romantic of the series, I think. Giulio and Alessio just LIKING each other too much to murder one another is great to me. I love their little murder journey, the way they always have each other's backs, the REVEAL!!! THE PAIN OF THE REVEAL!!!! How tender they are despite knowing they shouldn't be because they're just in love, dude. Also, one of the best meet cutes of all time, still thinking about it.

Mafia Mistress & Mafia Darling--I think this duet is like, arguably the campiest love story in the series, which is why I love it. Fausto is so funny to me; his inner monologue is always "!!!!!" he doesn't understand emojis, he and Frankie do THE MOST over each other. I also really love the way she challenges him to be not only a better partner for her, but a better father to Giulio. Giulio and Frankie's relationship is amazing; Giulio and Fausto's relationship makes me teary lol, the place it ends up at is just... really heartrending lol.

Mafia Virgin--I just read this, so it may move up! And this is not at all a knock on the book, it's a 5/5 on GR for me (a 4.75 on Storygraph, only because of something that really has nothing to do with the romance that I am probably more sensitive about than the average reader; and there was one thing teased that I could've used followup on, maybe she'll add it in a newsletter scene lmao). And I love this one. Giacomo ends up being such a softie, and I really love his insecurities re: people thinking he's stupid, it's something we don't see enough of in romance heroes because it's truly REALLY vulnerable. I also loved Emma's curiosity, her resolve, and..... I loved.... what they were about..... It's a simpler plot with simpler emotional conflicts than the others, to me, but it's still so well-done and I don't want to take away from that. The series just sets a super high standard, and again, someone has to be at the bottom!

Too bad now you have to give recs of "hero goes down on the clueless heroine and she’s like wow thanks that was AMAZING, can women do that to men too? 🤔 " haha

I love the clueless heroine going down on the hero, she has no idea what she is doing but her eagerness makes it a 10, Best blow job of my life 🤌🏻

@hptriviachamp posts every time the latter thing happens with a very apt meme that makes me laugh every time (IT AIN'T MUCH BUT IT'S HONEST WORK)

I can't remember a lot of PARTICULAR moments, but for these moments or this vibe:

You should definitely try Elisa Braden for this vibe. Mooost of her heroines are virgins (honestly: too many of them for me lol, I do need a bit more variation) and they're often all "WHAT'S THIS BUTTON DO" about sex. Her Midnight in Scotland series is really good. I think The Taming of a Highlander is the one where the hero is like "THERE'S NO WAY IT'LL FIT. WE MUSTN'T." and she's like "la la la it grows exponentially bigger when I look at it, I suppose I shall attempt to stuff it in la di da" blase about it.

One Good Earl Deserves a Lover by Sarah MacLean, one of her best. The heroine's a scientist who initially gets the hero to teach her about sex only! Verbally! Before graduating to physically! Also! She's very "if he'd let me study his penis with a magnifying glass I would" in nature. I also really enjoy the scene where he eats her out, comes in his pants, and immediately afterward is caught when his buddy stumbles in like "hey where do we keep th--OH. SORRY."

The Duke Gets Desperate by Diana Quincy doesn't have this scene/a totally clueless heroine, but it does have a scene where the hero is like "my dick is trying to make friends with your pussy" so there's that.

And in the same sense, because I fucking know these authors are friends and there's no way this was a total coincidence... Frankie in Mila Finelli's Mafia Mistress & Mafia Darling is NOT a virgin by any means. But when she and Fausto make it official, they do immediately roleplay him deflowering her as if she has literally never seen a dick in her life and it's HILARIOUS. Like these are DEEPLY COMMITTED people going "oh no! what's that????" "it's my dick! it's trying to say hello!" and I. Die. Not only because it's very funny, but because it actually makes their relationship more authentic to me. That's the kind of shit you only do with someone you deeply trust lmao.

Grace Callaway is gonna give you this vibe. Not all of her heroines are virgins, but the ones who are... often are precocious... and will like stuff their mouths with the hero's dick like they're doing the chubby bunny challenge.... The Duke Who Knew Too Much comes to mind because he's like "NO WAIT STOP THERE'S CRIME AFOOT" but she's already going for it.

Speaking of, Elizabeth Hoyt's Duke of Pleasure always deserves cred for the singular moment in which the hero and (virgin, grew up as a street rat dressed as a boy) heroine are investigating crime and some evildoers come upon them and he's like "quick just pretend you're blowing me" and she does start like, a mild actual beej while he's telling the guys "PLEASE LEAVE I'M GETTING BLOWN BY MY DOXY~" but after the guys leave he's all "so you can stop" and she's like "no no no I'm going somewhere with this". This one is special to me because he makes her spit into his fancy handkerchief after and I promise that even if he didn't know it that's when he decided to marry that girl.

I would say How to Marry a Marquess is one you should check out--by Stacy Reid. It's a classic "brother's best friend teaches me how to be sexy and then things get Really Outta Hand" book. I also really liked this one scene in it when his whole "let me teach you what dudes are into" thing leads to him like, eating her out in a moving carriage and when the carriage stops he does an entire "EGADS" jump off of her.

I need to reread The Lady Gets Lucky, but that's a rake meets virgin sex lessons book, and I have to think based off the scene I remember where he's like 30 seconds away from coming just from watching her lick her lips, there's a lot happening.