I recall back in the second apartment, the one they were in when Russia turned the cameras off, that she seemed to love swallowing Paul's cum. She was also a pretty poor cocksucker back then, preferring to lick it like a Dairy Queen cone rather than sucking a dick. Paul was never any help (still isn't) by letting her know when he was ready to shoot. Consequently, he would start when it wasn't between her lips. Several times that happened, she made a little "Oh" squealy sound and immediately got his dick in her mouth, taking the remainder, and finally swallowing it down.
Fast forward to now. It's rare that he will cum in her mouth. The most recent HotScopes video shows them in a form of 69 position where he's licking pussy and she's fully on her back, jerking his cock well away from her body. Eventually, he pulls her torso over to have her suck him, which she does for a moment. Then she pulls her head back and jerks him onto her breast. This is just one of several instances where she's had a perfect opportunity to swallow his cum, which a lot of people here seem to think she loves, but has opted to keep it out of her mouth completely.
It seems to me that up through the first year, or so, in Prague, she was doing what was necessary to build her reputation and fan base (i.e., $$$). Now that she's set, she's no longer caring about that (i.e., us). I'm sure Paul's sloven and likely stinky behavior hasn't done anything to entice her to continue her previous acting, but I can't place the full blame at his feet.
On the topic of Leora "loving cum," if she actually did, then she'd be licking up whatever missed her mouth the first time, not wiping it away with tissues. She's never shown any interest in "residue" ever other than rarely dipping a finger tip into a puddle on her belly and tasting it. That's less than a drop, and does not seriously count.