Let me start by strongly recommendig that no intermediate player and (imo) few if any A players adopt the suggestion that the first time responder mentions diamonds should be ace asking.
Anyway, absent special agreements:
1
♦ 1
♥
2N 3
♦
should be automatic.
S has a huge hand for slam purposes. He has 19 in controls.
I'd bid 3
♠, which is temporizing. We might, were our hand different, be expecting to sign off in 3N or play a red suit game. Thus we might bid this way with AKx Ax AQJxx xxx, not wanting to play 3N opposite something like QJx Kxxxx Kxxx x but happy to do so with the blacks reversed in partner's hand.
As it is, we're always moving on with this huge hand, but so is responder.
With responder's hand, I'd bid 5N over 3
♠, using 5N as a choice of slams. Opener, looking at Aces and spaces, and expecting that he may have to ruff, say, a heart in hand, will bid 6
♦
if you lack the tools...maybe 5N isn't in your bag of tricks, the auction becomes murky but one thing is clear: N must show excitement over 3
♠. The least he can do is cue 4
♣. Now opener can bid 4
♥, and responder could haul out keycard, in diamonds, if available. It wouldn't be for me, in the style I prefer, but I wouldn't be in that situation anyway, since I'd already be in 6
♦
I prefer transfers over 2N.
Responder bids 3
♣, which opener must obey since responder might hold a terrible hand.
Now responder shows the 5th heart, forcing.
so
1
♦ 1
♥
2N 3
♣
3
♦ 3
♥
Opener loves his hand and his first obligation is to say so. He could bid 3N but that is a regressive move and he has an enormous hand that has gotten better with the bidding. I suggest 4
♦ to set trump (not, repeat not, keycard). Responder now bids 4
♥ as kickback (4N would be a heart cuebid....a useful idea when playing kickback is to swap the meaning of the 'kickback cue' with the 'blackwood 4N').
Responder learns we're missing the trump Q and settles for the small slam.
'one of the great markers of the advance of human kindness is the howls you will hear from the Men of God' Johann Hari