It could be you're overthinking it. Just because she doesn't cum that way doesn't necessarily mean she's not into it.
Also even for women that cum from oral it's not a cut and dried formula and even the same lady may "tip over" from different things at different times, or not at all sometimes.
I used to have trouble understanding the idea that someone could enjoy "whatever" without cumming but the last few years, especially under specific circumstances I'll sometimes feel the urge to cum right away and if I suppress it I can build up to it again and sometimes I can cum and others I'll get stuck right at the edge where it seems I'm"right there, just a little , I'm right there" and it's unbelievably good.... I'll try to cum but if I can't I'm cool with it, but if I can reach the tip over point and cum, I cum really hard and it's really good.
Women I think can get that way too, sometimes it's from too much stimulus on her clit too soon or maybe the stars just don't line up right that day..
I'm evidently pretty good at going down on women, or they're lying to make me feel good, LOL. I try to get feedback as I go along and if you pay attention to how swhe's responding with most women I've been with you know when to apply more or less of this or that. It can be more subtle with different women but generally she'll either pull away or push into, or perhaps maneuver so that you're hitting an area she wants you to. She also might reach down and touch your head which can mean different things but usually it's something like "oh that's good but ease up or slow down some": In that case is she just touching or maybe pushing you lightly back to where you were just working or ??? But if she's going to get off usually it seems she'' start moving a little faster and if she's getting "jerkier" she may be right there, if she touches you head then it probably means "just like that and don't stop" but It seems to really mean" just like that until..." and when she goes off it can be hard to keep that spot because she's bouncing around so much but if you can let up ever so slightly. I find a lot of times at a certain point if I can just maintain the contact but not do anything it works. At first they may seem about to jerk away but when they feel that you're just going to keep a little pressure there with no movement they' relax and coast to a stop. A lot of women get very sensitive right as they cum and if you try to increase stimulation then you may get your ears torn off or something, but tother times they want you to actual increase but just a little.
There's a formula but it take a dozen supercomputers 300 years to work out and if she changes her hair color or maybe takes a different route to work that day they have to start over with different data, LOL/
When I get stuck my wife can get frustrated because she thinks I'm not getting anything and she'll start trying different things to get be over the brink... it can get really good then even if I don't go over and I'll try harder too... but often I'll have to give up or wear down to the point I just can't move. she'll be saying "oh you didn't cum" and all I can do is caveman grunts to try to explain "hey, this is real good... please don't kill me!"I remember one lady ,we played with a couple a few years ago.... I kept on and I think she may have faked it because she saw I probably wouldn't give up. I moved on to fucking her and then it was me that couldn't (I had taken a hydrocodone earlier) Her Hubby said "she wants you to cum" Karma's got a crazy sense of humor.
You'd think I'd learn but about a month ago we met a couple and I ended up linking and sucking on her clit for something like 6 hours , (yeah, really... and I know) nearly the whole times she's telling Wifey "oh, he's really good, I wanna take him home," and so on" I'm thinking at first it's going to be a snap, should happen quick.... but NO!
I never did get to fuck her. Silly me I've always thought a girl should get to cum. Probably stems from my feeling like I'd disappointed some girls in HS, although they never said anything, LOL
S you can try too hard. hat night actually ended the next morning with me still working away, Wifey playing with her tits and the other guy shoving his cock in her face and her working on that.... I think she did finally cum. We took a break, rolled a bowl I think and then "damn look at the time" That's when I found out it' had been 6 hours... Oh, well, LOL I guess some women would have clubbed me with whatever they could reach.