He wasn't sure if he'd be able to, but that twitch in her cock is a pretty good indication that she's able to pull off a third one...and if she can, he'll gladly take another mouthful of thick dragon cum. He'll have to be gentle, though--with her expanded out as far as she is, she'll be super sensitive to anything he does to her. While she could probably handle a more assertive grip, it'd be wiser to let her enjoy the unique experience of her hypersensitive state.

He takes the tentacle that was holding her leg earlier and rubs it against the lips of her cunt, giving her a little pleasurable announcement that he's going to start pushing it in there. It's a slow, gentle approach, because there's nothing but a ton of pressure coming from inside her which will inevitably make even the thinnest part of his tentacle feel huge as it slowly slides inside of her, sucker side running along where her dick meets her cunt. He continues his gentle massage of her belly the entire time.