Okay, I know Harry lost the ability to speak Parseltongue after he defeated Voldemort, but hear me out. Imagine Harry whispering sweet nothings in Parseltongue and just barely touching Draco’s ear with his lips, imagine this sending shivers down Draco’s spine and turning him on more than anything. Imagine Draco being eager to learn as much of the snake language as he can. Imagine after an intense and passionate kiss between the two of them Harry whispers something against Draco’s lips and the blonde boy says “What does that mean?” and Harry just looks deep into Draco’s eyes and says I love you in English and Draco smiles broadly while repeating what Harry had said moments ago in Parseltongue.
I had to get that out of my system, the Parseltongue kink is real over here