They weren't really communicating that much, and their behaviours are making their assumptions worst.
The word you're looking for, my good sir, is regret.
It's love , he has fall in love and feel regret for all his actions
This!
The whiplash lol, these characters' decisions for figuring each other's feeling is not written in the best way possible. Maybe author-nim is cooking, who knows, judging from Dan's facial expression in the end. Maybe it was just a pity sex thing, but the feeling's all gone. He said it himself, he liked the action in some moments but he never said that he liked JK again or that feeling of liking him returned.
Heeryang was expecting it from the start. He'd imagine an angrier, vitriolic reaction to the point of more than wishing him to death. Some acting would've been nice, wouldn't it? A cry here and there, some screams fo Yeonjeo. But no, he kept too suspiciously composed!
Since this is their first, we get to ignore everything else they just did lol but it was hot
Anyway, Eunsan needs to prep at least one to two hours. By prep that means "cleaning" and stretching the hole (literally). Ryu also needs to prep him during the woohoo, fingering is enough (but the bottom may as well do it himself if he's more comfortable with it). What they also need more to do is longer foreplay time lol, releases all that "unreadiness" that's still lingering. Ryu needs to use a LOT of lube and should start slow when entering and thrusting because that sh*t hurts a LOT when forced and Eunsan would not enjoy it very much (or would deter him from doing it again next time). Build momentum from there and always listen to the bottom, then enjoy!
I love it when the Uke has a backbone and isn't afraid to fight back. And smart! Too many BLs out there with stupid ukes.