Agreed!, fuck him if he uses sex as leverage.
I thing he needs to put the big boy's pants on, act like he's somewhat mature and treat her like the sweet sexy wonderful woman that she is.
All of you have sensed something which is deeply true ;) ;) ;)
Of course, Diana and Efim are both actors, and they are acting, but the impression is that, in their REAL LIFE, she's asking more attention by him, which is not necessarily intended as another attempt of penetration.
But it's something that he's is not yet prepared to give to her. I hope this is due to his young age.
My impression is, at the same time, that she still must learn that having an orgasm for a woman it's not like pushing an on/off button. Sure he can't help her in this progress for now.
Take care
Bye