indie mouthing kitten, is this ok?

when tao tries to suckle on indie, she takes him on her mouth, literally his whole body, but she doesnt bite down, but appears to put a bit of pressure, could be wrong. but he does meow when he does this so dont know if its cos shes hurting him or if hes protesting to being moved from her teat.
She seemed ok this mornin with him suckling, but now if he tries to do so shes really mouthy on him and keeps nudging him but doesnt get up to move away?
ive been trying to discourage him and bring him away from her, but she promptly comes to nudge him again.

any ideas?

jenny it might be hurting her cos kittens have sharp teeth.maybe she needs a break from him, and keep them apart for a while.good luck