During sex when you’re close and it starts to feel too good and instinctively get the tiniest bit panicky and try to move away from how good it feels, just Frank gently guiding you back/holding you in place and cooing about how brave you’re being and how you’re his “brave girl”
It's like that moment where it's like "uh oh, it's too much, what is my body gonna do??," and you get all squirmy and cover your face or fold in on yourself and daaammmmnnn Frank is steady as a rock and he's actually got you right where he wants you.
When your hand flies up to your face, he gently pulls it down and then your knees pull into your chest but he's easing those open and then you tug at your hair saying "ohmygodohmygodohmygod" and he's pining your arm back to your side. It's all quick flailing movements but Frank is quicker at each one, making you come back to the moment and feel it acutely.
"ohmygod Frank no," you say but not in a "no, stop" way but in a "no I'm scared" way and Frank knows this so he continues, steady and forceful with each thrust as he says "YES sweetheart. Ain't gotta be scared," finding your eyes to make sure you heard him.
You arch your back so the top of your head is pressed into the mattress because your body needs to do something now that Frank has you pinned in place but the whole thing only gives Frank a better angle for each thrust to glide against your sensitive clit, finally drawing a yelp from deep in your throat.
"Be still sweetheart," his brow beading with sweat from the excursion but his voice steady and commanding. The idea of stillness feels impossible and your body couldn't do it if you tried but Frank is cooing at you anyway, "That's it, bein' brave for me like this."
With your lower back raised from the bed, Frank bends to lace his thick forearm behind your back and scoop your body up and more flush to his as he increases the pistoning of his hips. The move has you like a ragdoll in his arms, limbs dangling as you meekly claw and scratch at nothing because the implosion is building deep in your belly and you're pinned too throughly to Frank to squirm away.
"Easy baby," Frank says like he's taming a wild animal, sensing your panic, "You trust me babydoll? You gotta let go," he directs you, and your body complies, finally curling into him as you cum, tremoring in his arms and clamping around his cock so hard that it makes him wince and stutter, cuming in his own right but not faltering. You feel vulnerable and unable to control your body, whimpering and whining as his arms keep you upright against his chest.
"That's my pretty, brave girl," he huffs, his mouth close to your ear, "there she is." He feels your orgasm yielding, the tiny spasms of aftershock still making your legs twitch and the mess of his cum leak where you meet and your whines still persist. "See you're ok sweetheart," he assures you, "so fuckin' gorgeous bein' brave for me baby."