Oooh.
I've considered Ayin/Binah, or even the many faces of Ayin with Carmen. But admittedly the idea of Binah/Adam specifically had not come to my mind before!
I think that while Binah is fascinated by Ayin as the man who kept looking above her head and directed his gaze at the powers at the very top during his work, she'd also be fascinated by this facet of Ayin who wants the most extreme version of their goal. To 'unlock' the true face of humanity because of his extremist goals with Carmen's idea of helping humanity with the Light. Binah has a pretty distorted view of humanity already, so I think they could have fun making each other worse /pos. And possibly also bang on a desk and kiss with tongue.

Ooh, that could be fun. If Dulcinea is presenting herself as a honeytrap, trying to act in ways that she knows would draw Don Quixote into wanting to assist her as a 'helpless damsel' who would Obviously need her aid. And Dante feeling the creeping dread of keeping a secret and coming to understand just how much Faust has been carrying on her shoulders all this time.

But it could alternately be that they have an Alucard-Alexander Anderson type of dynamic and Dulcinea knows what Don is the whole time. And she's just laying in wait for the time when Don re-awakens and she gets to have her fated glorious battle like she wanted so badly.

That one is a pretty complicated answer due to the inherently complicated nature of their relationship.
Their very first interaction was Angela saving Angelica and her unborn child from being killed and absorbed by the Pianist when she was without her primary weapons and when her body was weakened as to reduce her ability to fight or flee. So in that brief moment, Angela was like a guardian angel who swooped down and saved her life and her baby's.
But once Roland arrived back in the picture and reunited with Angelica after destroying the Pianist, it would become very apparent to Angelica that she herself wasn't Angela's primary focus. Angela would be pretty blatantly focused on Roland, even if she were also pushing him away because of various complicated emotions. At the start, Angelica in Angela's eyes was less of a person and more of a vessel for her own redemption. In saving some version of Angelica, Angela was able to give A Roland (even if not Her) Roland, the kind of life and happiness that Angela's own actions unintentionally stole from her. Angelica would see Angela giving Roland longing looks, and the pain in her eyes when Roland showed his love for Angelica when Angela was in the room. And how Angela seems both fascinated and saddened when Angelica eventually lets her feel the baby kick. But Angela still never treated her badly, and would be doing all she could to keep Angelica safe and make her comfortable.
Angelica would probably also have her own complicated feelings about the matter, since this is still another woman who pretty blatantly has feelings for her husband. Though overtime as Angela started to show more vulnerability and started to let her guard down a little around Angelica, Angelica would warm up to her more genuinely and want to see her open up more.
On Angela's side, the feelings are probably just as complicated. Her being here at all is both a means of redemption but also a method of self-flagellation. She's giving this Roland a chance at a happy life with his child and the love of his life. That's bad enough. But it's also the sense that this isn't Her Roland. This one never knew her, never got close to her or who he saw bare her heart/bore her heart to her via the Realizations. And since he still has Angelica, if he thought Angela was trying to show affection toward him he'd probably be far more likely to rebuff any open attempts since he's a married man and Very in love with Angelica. Though it would be a very strange feeling for him that Angelica seems to know so much about him and how her icy exterior she tries to put up softens just for him.
From Angela's view, Angelica is her penance. Keeping Angelica alive and helping Roland stay with her is her way of making up for her actions taking everything away from him and giving him so much pain. She was never mean to BE Roland's Angel. That place was originally Angelica's, and it's selfish of her to still want that even though her journey to get here was meant to be a selfless one. But selfishness is still a very human trait. And she occasionally has to indulge herself in that, whether it be brushing her hand subtly against his or just indulging in his kindness to her, even in front of Angelica.
And Angelica herself is also generally a nice person. So anytime she'd try to be nicer to Angela or try to get her to open up, that'd just make her feel worse. Knowing that she'd taking advantage of both their kindness.
It's very complicated all around.

Oh for sure. Angelica would love to see him all done up in that for her. (Playing with her food)
Ironically I think Roland's normal outfit but disheveled is what does it for her most. (That or anything to do with furry stuff).
It's a small headcanon of mine that Angela's robot body in LobCorp was absent of any sexual components besides her general shapely figure (no nipples or genitalia, basically a Barbie doll anatomy situation). So I personally think that she doesn't have much of a sense of modesty. Angela never really needed one since she was always fully clothed and never really had a 'need' to get naked anyway. She'd know on a logical level that she was made to be visually appealing, including sexual appeal with her figure, but Angela herself doesn't strictly view her own body in a sexual sense besides being aware of how others might perceive her physical appearance. (Very specific kind of ace mood.) Whether she retains that kind of blank body or if she gains those features like on a human body.
What I'm saying is that, for Angela, she may have the view of clothing being more akin to different types of accessories than anything else. So she'd probably be interested in trying out a lot of different things. Including more racy ones like lingerie or costumes which she'd want to show to Roland.
I enjoy the idea that she walks up to Roland and just yanks open her shirt to show him a new bra, and he jumps half a foot in the air. Or she tells him she wants to show him something new and she's standing there in a bunny suit or something. She'd enjoy seeing his reactions but at least until she figures out what she likes it'd be for her like she's trying on different earrings to show off to him. Except those earrings also happen to give him boners.

The concept of them can be so fun!
Dante clearly trusts Faust a great amount and sees her as a valuable source of information. They turn to her every time they feel lost or confused no matter what it is, even when they know she can't always tell them the 100% truth. But they're willing to accept that because they value her and what she has to say so much.
And Faust does seem to know Dante so much more than they know them. How much does she know about them? Does she ponder what they'll think of her if they go back to who they were vs the kind of person they're becoming now?
I think it's also an interesting concept that neither of them knows who they are. Dante because they lost their whole identity along with their head. Faust because the Gesellschaft seems to basically run her life and didn't let her decide what kind of person she wants to be outside their collective goals, whatever that may be. They're growing and learning who they are together.

I've got a couple possible ones rolling around in my head.
One SFW where it takes place in the G Corp world. Where Outis, after being punished by G Corp's army, is wandering the Backstreets from place to place. And runs into the feral Gregor leftover from the war who's still struggling to hold onto his humanity. And they bond a little about being remnants of a war that people want to crush and then sweep aside now that they've gotten their use out of them.
And the other being more NSFW fare where Rodya tries out a perfume or soap or something that she doesn't realize is really attractive to Gregor's sense of bug smell, and he wants to bone til he's dry because of it.
Fun stuff.

Oh I think he totally has at one point. Though it would really be a whole thing wherein he really wouldn't feel much of anything outside of grief in my mind. But maybe at his really low points when he really just wants to feel anything he'd probably at least Attempt to jerk off. Even if it doesn't do much of anything for him besides wallowing in it.
Same for Angela tbh. Silent frustrations she was never able to fulfill. Though in her case perhaps she would also have Daemon to help her work these things out physically so it wouldn't just be her doing it alone. It would be no more satisfying and just as unsatisfying for her emotionally in the end.