He chirped at him, confused but taking his hand. His eyes widened a bit-and he grinned, showing off sharp teeth-predator teeth-and then he started to sing.
"HF-"
His eyes widened for a split second before falling into his spell (I dunno want to call it lmao-) he then slowly started going deeper into the water, Denki then saw Katsuki, he then ran after him.
D: "BAKUGOU!!!"
He then got into the water-right before Kat's was knee-deep into the water, Denki grabbed his other hand, tugging him away from the Siren, pulling him out the water.
R: "H-HEY!! COME BACK HERE!!"
Ren's lower lip quivered. He then bit it as he looked at the Siren leave, he looked down at the water, slowly backing up onto shore. He was too afraid to go any farther. Denki on the other hand couldn't just see his best friend get taken by a siren. He went deeper into the water, chasing after the siren. GO DENKI GO-
D: "DAMMIT!! UGHH-"
He sighed, as he swam back to shore, giving up..he felt..horrible..I mean, he just witnessed his friend leaving..just because he didn't save him on time..Ren was waiting on shore for Denki, when he saw that he didn't have Katsuki..he was heartbroken. He didn't have a crush on Katsuki or anything like that-but he cared about him.
D: "I-I tried-I couldn't catch up with that stupid Siren-"
"....I-It's fine."
You know it's not "fine" Ren.