Since it's No Nut November I think it would be appropriate for Kaveh to tease Alhaitham, no? He's had his way with him for so long that it's only fair for Kaveh to have his fun now too.

He could put a cock ring on Alhaitham, tie his hands and feet, maybe even a mouth gag? And when the scene is set he would be the worst tease known to man. Slightly blowing air at the tip of his dick, leaving small kitten licks in-between the slit of his tip which are never enough to gather up the built up precum, frustrating Alhaitham even further. And the second Alhaitham's dick starts twitching from how hard it is, Kaveh would be the tiniest bit merciful and start grinding his pussy lips along its length but never hard enough for the tip to enter. He would let himself be selfish and increase the pace, feeling the weight of his beloved's desire for him would be enough to make him see stars. Being as vocal as he can be, he purposefully would monologue how /good/ he would feel if he were inside him. How his tight walls would bind around his length, milking each drop of his love until he was full of it. And Kaveh would come just like that, all over Alhaitham's dick while panting heavily, lust never leaving his eyes.

At that point Alhaitham would be struggling to keep a clear mind, trying his best to buck against the wetness that was around his cock but failing due to his restricted movement. All he could do was beg Kaveh with his eyes and the second Kaveh sees his gaze he would lean closer, kissing the spot between his brows while telling him how good he had made him feel. But the moment Alhaitham thinks Kaveh would untie his ropes or let him kiss him properly, he leaves the room with the excuse of needing water.

When he returns he would be met with an extremely frustrated Alhaitham. His cock now constantly aching for Kaveh's warmth, still wet from his earlier activities. The teal of his eyes would be barely visible, his pupils blown wide in desperation the second he sees Kaveh return. And how could Kaveh deny such a lustful look? So, he would ride him with the cock ring still on, coming as many times as he wishes until he believes Alhaitham deserves a reward for being so patient for him.

The rest of this can be left to your imagination but I am a firm believer of Kaveh wishing to tease his husband until his balls are physically blue (/hj).