Some things to note.
If you block attacks, most of them do no damage. It's way better than in previous games.
In order to get her lewd you have to counter her kick attack, you'll grab her leg and you'll have until her action bar goes to the top till she breaks out of it. You can use one action bar to finger her(or you can H her in that position) or use a special to immediately break her panties. Depending on the angle she high kicks you, another option will be there to spank her, this seems to give her less lewd gauge. Every time you do this a pink meter fills up near her action bar, once filled up it turns into a heart.
She will ALWAYS do a grapple attack on you after this, you can either block it to keep the heart or let her hit you with it to lose a heart. With one heart, her grapple attack will be a foot job(or you can have her squat down and jack you off). If you block it and get her up to 2 hearts, she'll do the 69 position on you. If you get her to 3 hearts, she face-rides you. 4 Hearts she'll do cowgirl. If you block her at 4 hearts, she immediately loses all hearts and goes back to having none, so you'll have wasted them.
I'm not sure what specials they are in the shop so this will assume you've simply bought all of them. All of the special attacks on the left are a type of hadouken attack, you have to get her knock-down gauge high enough and then use it and it will destroy a piece of her clothing. Doing it to her head has no real use and it will have no effect if her knockdown gauge isn't maxed out by the hadouken attack.
The top-right special is a double hit attack, if you knockdown her with this she will be in the doggstyle position. You can spank her(same as her high kick) or doggy-style her.
The bottom right special is a super-combo, be aware that this usually insta-kills her in most rounds, I had to turn off some of my attack levels so it didn't kill her. If you do this she will be knocked out until her action bar fills up. The top left option is a blow-job/tit job while she is asleep. The middle left option is missionary, and the bottom left option is doggy style. The middle of her chest will be a breast fondle, which increases her lewd meter, kinda useless as she'll be almost dead(and these lewd attacks still do damage). Clicking on her groin fingers her. Clicking on her stomach punches her in the stomach and does normal damage, if you're in a hurry you can knock her down and then punch her in the stomach and this usually KO's her at max stats on any mode.
When you click right before she attacks, if you hit her in the center you will counter her attack, do high damage to her, and use up 2 of your action bars. This makes the game incredibly easy.
I'm not sure if this is the only way to do this, but whenever she does an attack where she jumps into the air, if you use the top-left special attack(blue colored) you will counter her with massive damage, this usually kills her. When this happens she will be sitting upright, you can then do a forced blowjob from this position.
Also you can stunlock her, if you combo her to get her knockdown meter at max but don't follow up with anything, her current action gauge will go to zero and she'll be ''dazed''. This effect wears off once her action meter goes up again, but you effectively waste 2 of her turns doing this.